Question

Which equation is not an identity?

A.) tan(-t) = -tan t

B.) tan t(csc t + cot t) = sec t + 1

C.) sin tcot t = cos t

D.) Cos^2t - sin^2t = -1

Answer 1

D because cos
${ \cos(t) }^{2} + \sin(t) {}^{2} = 1$

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Answer 2

Answer:

A on edge  sin t+ cos t/ 1+cot t=sin t

Step-by-step explanation: