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Syllabus

What is componendo and dividendo method? Plz explain.

If log

_{10}(ab)^{3}=log_{10}(a^{2}b)=1, then the value of log_{10}(ab)???^{-1 }1/ root 5 + sin^{-1 }2 /root 5 = pi/2cos20.cos40.cos80=1/8

prove that tan^pi/16 + tan^2pi/16 +.........+tan^7pi/16 = 35

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

1. An engine pumps 2000kgs of water in 1 minute to an average height of 10m.Calculate the power of the engine if 30% of the energy is wasted in the process.

2. A water pump of power 1.5KW draws water through a mean height of 10m to fill a tank 4m x 3m x 4m. Calculate the time taken to fill the tank

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??

prove the following :

root 3 cosec 20 - sec 20 = 4

prove that tan20 .tan40.tan80=tan60.

find the derivative of cotx by the first principle?

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

PROVE THAT

cos

^{3}A + cos^{3}(120+A) + cos^{3}(240+A) = 3/4 cos3AsinA . sin(60-A) . sin(60+A) = 1/4 sin3A

minimum value of sec square theta + cosec square theta

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.

can we find the value(in degrees) of tan(4/3)

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

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

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

prove that tan 50 = 2 tan 10 + tan40

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

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

In any triangle ABC, prove that

c - bcos A / b - ccos A = cos B/ cos C

Urgent

sin10*sin50*sin70=1/8?

prove that

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

sin 105 degree +cos 105 degree =cos 45 degree

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}AFind 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

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

show that : (2sinx - sin2x) / (2sinx + sin2x) = tan^2 (x/2)

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

Prove that:

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

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

in any triangleABC P.T

(b

^{2}-c^{2})cotA + (c^{2}-a^{2})cotB + (a^{2}-b^{2})cotC = 04/3 cot square 30 degrees + 3 sin square 60 degrees-2 cosec square 60 degrees -3/4 tan square 30 degrees =10/3

Prove cos5x=16cos

^{5}x-20cos^{3}x+5cosxx-y / x+y sin theta.

prove 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)

Prove that sin

^{2}A/2 + sin^{2}B/2 + sin^{2}C/2 = 1 - 2sinA/2 sinB/2sinC/2show 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!!

Thea value of cos pi/14*cos 3pi/14 * cos 5pi/14 is ?

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

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

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

What is the value of sin450*??????????

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)tan 18 + tan 27 +tan 18. tan 27 = 1

Please explain working

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

EVALUATE cos(-1125)

Solve sin2x+sin4x+sin6x=0

prove that

cos20cos40cos60cos80 =1/16