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Syllabus

What is componendo and dividendo method? Plz explain.

cos20.cos40.cos80=1/8

PROVE THAT

cos

^{3}A + cos^{3}(120+A) + cos^{3}(240+A) = 3/4 cos3AProve that.....Tan 70 = tan 20 + 2 tan 50...

Solve Sinx + Sin3x + Sin5x = 0.

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

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

prove the following :

root 3 cosec 20 - sec 20 = 4

find the derivative of cotx by the first principle?

prove that tan20 .tan40.tan80=tan60.

show that sin

^{3}(180+A) . tan(360-A) . sec^{2}(180-A) / cos^{2}(90+A)cosec^{2}A . sin(180-A) = tan^{3}Asin

^{4}x+cos^{4}x=1-2sin^{2}xcos^{2}xQ: prove that cos

^{3}x+ cos^{3 }( 2pi/3 ) + x ) + cos^{3}(2pi/3 )- x)=3/4cos 3x.cos

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

if cosx=-1/2, find the general solution

^{2}45 degree+ cos^{2}135 degree + cos^{2}225degree + cos^{2}315 degreeif 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 cos 2pi / 15 cos 4pi / 15 cos 8pi / 15 cos 14pi / 15 = 1 / 16

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

prove that tan5x+tan3x/tan5x-tan3x=4 cos2x cos4x

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

(i)SIN (X+Y) (ii)COS Y/2

prove that tan 50 = 2 tan 10 + tan40

prove that

( cos 17 +sin 17 )/(cos 17-sin17) = tan 62

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

prove that

tan (A+30) + cot (A-30)=1/(sin2A-sin60)

Prove that sin3x + sin 2x – sinx = 4 sinx cos x/2 cos3x/2

^{4}x + sin^{4}x) = 1/2 (2 - sin^{2}2x)sin10*sin50*sin70=1/8?

prove that : sin pi/5 * sin 2pi/5 * sin 3pi/5 * sin 4pi/5 = 5/16

sin 105 degree +cos 105 degree =cos 45 degree

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

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

if sin(a+b)=1 and sin(a-b)=1/2 , where 0<=a, b<=

π/2 , then find the values of tan(a+2b) and tan(2a+b).cos4 pi /8+ cos4 3pi /8+ cos4 5pi /8 +cos4 7pi/ 8=3/2 prove it fast rely plssss

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

Can you pls find the value of Tan(-2025).

My answer was -1....Am i right???

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.

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

Prove that:

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

in any triangleABC P.T

(b

^{2}-c^{2})cotA + (c^{2}-a^{2})cotB + (a^{2}-b^{2})cotC = 0Prove cos5x=16cos

^{5}x-20cos^{3}x+5cosxprove that cos11+sin11/cos11-sin11=tan56

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

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!!

4/3 cot square 30 degrees + 3 sin square 60 degrees-2 cosec square 60 degrees -3/4 tan square 30 degrees =10/3

Prove that tan4x= (4tanx(1-tan^2x)) / 1-6tan^x+tan^4x

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

Solve the equation:

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

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

cos 4x sin 3x - cos 2x sin x / sin 4x sin x +cos 6x cos x = tan 2x . prove it

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

If in a triangle ABC , (2cosA/a)+ (cosB/b) + (2cosC/c) = (a/bc) + (b/ac) then find the value of A in degrees.

13 sin A+5 sec A divided by 5 tan A + 6cosec A

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.

prove sin

^{2}A - sin^{2}B/sinA .cosA- sinB. cosB = tan(A+B)prove that sin10 sin50 sin60 sin70 =root 3/ 16

prove that sin20 sin40 sin 60 sin80 =3/16

Prove that: cosA cos2A cos4A cos8A =sin16A / 16sinAprove that

sin(-420).cos(390) + cos(-660).sin(330) = -1

help plz ... my RHS is coming +1 ... totally confused .. help plz.. as soon as possible !!

Please explain working

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

cos a +cos b =1/3 and sin a +sin b=1/4 prove that tan(1/2(a+b))=3/4

EVALUATE cos(-1125)

Solve sin2x+sin4x+sin6x=0

^{4}(theta) - sin^{4}(theta)prove that

cos20cos40cos60cos80 =1/16