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PROVE: Cos 2theta = .5
sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly
sin(2theta) cos(2theta)
2 answers
asked by
Sally
1,782 views
Solve tan(40/90) for the double angle cos(2theta). I know I use the x^2 + y^2 = r^2 formula and cos(2theta) = cos^2theta -
1 answer
asked by
Anna
658 views
Prove or disprove the following identity
sin^4theta - cos^4theta = sin^2theta-cose^2theta
1 answer
asked by
Jerry
502 views
Prove: [(tan^2theta+1)(cos^2theta-1)]=1-sec^2theta
1 answer
asked by
Blaire
517 views
establish identity
5csc^2theta-3cot^2theta=2csc^2theta+3
1 answer
asked by
Anonymous
442 views
What is the integral of 1-tan^2theta from 0 to pi/3?
Using the identity tan^2theta=sec^2theta-1, I got my answer to be 2pi/3 -
1 answer
asked by
Rachel
588 views
if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cost^2theta)(1+co-^2theta)
the answer should be 49/64 but i couldn't
2 answers
asked by
rani
1,073 views
sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly
sin(2theta) cos(2theta)
1 answer
asked by
Larry
2,020 views
Demostrate the validity of tan^2theta-sin^2theta=sin^4theta sec^2theta
1 answer
asked by
Mb
861 views
Prove that tan theta+tan 2theta+tan 3theta=tan theta*tan 2theta*tan 3theta
1 answer
asked by
radhika pandey
600 views