Posted by Britt on Tuesday, December 20, 2011 at 8:40pm.
Hey, I did this for you long ago.
Twice in fact
copy again
sin a cos b + cos a sin b = sin (a+b)
so sin (7t)
1/(1/cos x -1) - 1/(cos x +1)
cos x/(1 - cos x) - cos x/(1+cos x)
[cos x(1+cos x) - cos x(1-cos x)]/(1-cos^2 x)
[ cos x + cos^2x - cos x +cos^2 x]/sin^2x
2 cos^2 x/sin^2 x
2 cot^2 x
ohh, i didnt realize! thankyou :)
Please check before repeating posts. Some other teacher might have done it all over again.
okay!
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