Asked by Anonymous

cotxsinx - cosx + cosx

Does this equal cos x ?


cos/sin * sin = cosx
Answered by Anonymous
cot(x) = cos(x)/sin(x)

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Now you have:
[cos(x)/sin(x)] - cos(x) + cos(x)

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What's the answer?
Answered by Anonymous2
By the way, the person who just commented is me. I should've changed my name.
Answered by Arora
cotxsinx - cosx + cosx

Putting in cotx = (cos/sinx),

(cosx/sinx)*sinx + (- cosx + cosx)
= cosx*(sinx/sinx) + 0
= cosx*1
= cosx
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