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Syllabus

What is componendo and dividendo method? Plz explain.

find the derivative of cotx by the first principle?

cos20.cos40.cos80=1/8

Prove that.....Tan 70 = tan 20 + 2 tan 50...

find the general solution of equation sinx-3sin2x+sin3x=cos x-3 cos 2X+cos3x

Solve Sinx + Sin3x + Sin5x = 0.

sin 20 sin 40 sin 60 sin 80=3/16

cos theta.cos2 theta.cos3 theta=1/4 find theta

solution of ml agarwal for isc 11std

The chapter trigonometry in RS Aggarwal book (of class 11th) is divided into 6 sub-chapters. But its chapter 5 ( Solution of triangles ) and 6 ( Graphs of trigonometric functions ) are not the topics of NCERT Book.

Now my question is:

Should I study these two chapters (5 &6 of RS Aggarwal) as these are not in NCERT Book?prove the following :

root 3 cosec 20 - sec 20 = 4

if sin alpha + sin beta= a and cos alpha + cos beta= b, show that

1. Sin(alpha+beta)= 2ab/a sq.+b sq.

2. Cos(alpha+beta)= b sq.-a sq./b sq.+a sq.

prove that tan20 .tan40.tan80=tan60.

sin

^{4}x+cos^{4}x=1-2sin^{2}xcos^{2}xcos

^{2}x + cos^{2}(x + pi/3) + cos^{2}(x - pi/3) = 3/2. provecotx cot2x - cot2x cot3x-cot3x cotx=1

find the general solution of cosecx=1+cotx

prove that cos20 cos 40 cos 60 cos 80=1/16.

sinA . sin(60-A) . sin(60+A) = 1/4 sin3A

cos2xcos3x - cos2xcos7x +cosxcos10x/sin4xsin3x- sin2xsin5x+sin4xsin7x = cot6xcot 5x

cos4 pi /8+ cos4 3pi /8+ cos4 5pi /8 +cos4 7pi/ 8=3/2 prove it fast rely plssss

prove that cos 10.cos30.cos50.cos70 = 3/16

Prove that cos10x+cos8x+3cos4x+3cos2x = 8cosxcoscube3x

prove that tan 50 = 2 tan 10 + tan40

If in a triangle ABC a

^{2}-b^{2}/a^{2}+b^{2}=sin(A-B)/sin(A+B), prove that it is

either a right angled or an isosceles triangle.

1.(1+cos pi/ 8) (1+cos 3pi / 8) (1+cos 5pi / 8) (cos 7pi / 8)=1/8

^{2}+y^{2}=16x, then what is the value of k?Prove that sin3x + sin 2x – sinx = 4 sinx cos x/2 cos3x/2

PROVE THAT

cos

^{3}A + cos^{3}(120+A) + cos^{3}(240+A) = 3/4 cos3A^{o}. If r is the inradius and R is the circumradius , then 2(r + R) is equal toa) a+b

b) b+c

c) a+c

d) a+b+c

sin10*sin50*sin70=1/8?

In a triangle ABC, angle C= 90 degree,then findthe maximum value of sinA.sinB .

sin 105 degree +cos 105 degree =cos 45 degree

Prove the following: cosA / 1 - sinA = tan (45 + A/2)

in triangle ABC if b+c/11 = c+a/12 = a+b/13

PT cosA/7 = cosB/19 = cosC/25

Find the maximum and minimum values of sin^4x + cos^2x and hence or otherwise find the maximum value of sin^1000 x + cox^2008 x

FIND THE GENERAL SOLUTION OF

COS X . COS 2X . COS 3X=1/4

cos4 pi / 8+cos4 3pi /8 + cos4 5pi / 8 +cos4 7pi /8 =3/2

if in triangle ABC, a=4 , b=3, & A=60degrees, then c is the root of the equation ______

(a) c

^{2}- 3c -7=0 (b) c^{2 }+ 3c+7 =0 (c) c^{2}- 3c + 7 =0solve using trigonometric equations and property of triangle.....

if A+B=45 degree.show that {1+tanA}{1+tanB}=2

Prove that:

4 cosA cos(60-A) cos(60+A) = cos3A

in above question hour hand in 4hours 30 minutes =9/2 hours how?in any triangleABC P.T

(b

^{2}-c^{2})cotA + (c^{2}-a^{2})cotB + (a^{2}-b^{2})cotC = 0In triangle ABC, prove that : a

^{3}sin(B-C) +b^{3}sin(C-A) +c^{3}sin(A-B) = 0prove that cos11+sin11/cos11-sin11=tan56

Prove cos5x=16cos

^{5}x-20cos^{3}x+5cosxroot 3 cosx +sinx = root 2 how to solve?

^{2}=a^{2}+c^{2}b)b^{2}=ac c)2b^{2}=a^{2}+c^{2}d)none of these please give the solution too,not just the answer.prove using sine rule - 1) sin ( B-C)/2 = b-c/a cos ( A/2)

2)1+cos(A-B) cos C / 1+cos(A-C) cos B = a2+ b2/ a2- c2

3) (b-c)cot (A/2) + (c-a)cot (B/2) + (a-b)cot (C/2) = 0

4) a cos(B-C/2) = (b+c) sin(A/2)

5) c/(a-b) = tan(A/2) + tan(B/2) / tan(A/2) - tan(B/2)

6) a(cos C - cos B) = 2(b-c) cos^2 (A/2)

show that tan3x-tan2x-tanx =tan3x*tan2x*tanx

Prove that sin(a) + sin(a+h) + sin(a+2h) +.........+ sin(a+(n-1)h) =

(sin(nh/2) sin(a+(n-1)h/2)/sin(h/2)Prove that tan4x= (4tanx(1-tan^2x)) / 1-6tan^x+tan^4x

IF cos(alpha + beta) = 4/5 and sin(alpha - beta) = 5/13

FIND THE VALUE OF tan 2 alpha, where 0 is less than equal to alpha is less than equal to pie/4.

plz reply!!

the value of 3+cot76cot16/cot76 +cot 16 is

a tree stands vertically on a hill side which makes an angle of 15degree with the horizontal. from a point on the ground 35m down the hill from the base of the tree, the angle of elevation of the top of the tree is 60degree. find the height of the tree.

ans(35root2m) plese tell the xact solution

Show that cos 24 + cos 55 + cos 125 + cos 204 + cos 300= 1/2

Solve the equation:

4sinxcosx + 2sinx + 2cosx + 1 = 0

prove-

cos

^{2}(pi /8) + cos^{2 (}3pi / 8) +cos^{2}(5pi / 8) +cos^{2 (}7pi / 8) = 2If A+B+C = pai, prove that

sinA + sinB + sinC = 4 cosA/2 cosB/2 cosC/2

The angles of a triangle are in AP and the ratio of the number of degrees in the least to the number of radians in the greatest is 60:

π. Find the angles in degrees and radians.

solve 3tan((theta)-15)=tan((theta) +15)

Please explain working

prove that 1+cos2x+cos4x+cos6x= 4cosx cos2x cos3x.

Prove it : tan(x+y)tan(x-y)= sin

^{2}x-sin^{2}y/cos^{2}x-sin^{2}yEVALUATE cos(-1125)

prove sin

^{2}A - sin^{2}B/sinA .cosA- sinB. cosB = tan(A+B)^{2}C / 2 + c sin^{2}A/2 ) = c+a-bProve that: cosA cos2A cos4A cos8A =sin16A / 16sinASolve sin2x+sin4x+sin6x=0

HOW TO PROVE:

( sinx / cos3x) + ( sin3x / cos9x) + (sin9x / cos27x) = (tan27x - tanx) / 27

cos6x = 32cos

^{6}x-48cos^{4}x+18cos^{2}x-14/3 cot square 30 degrees + 3 sin square 60 degrees-2 cosec square 60 degrees -3/4 tan square 30 degrees =10/3