Which equation is not an identity?

tan (-t) = - tan t

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

sin tcot t = cos t

cos2t - sin2t = - 1

Question

Turtle

6 April, 07:45

+4

Answers (2)

Know the Answer?

Sullivan Adkins · Answer 1

Hey there,

Let t = 0 and you'd get 1 - 0 = - 1 which is false

I would go for (D)

Desirae Bishop · Answer 2

Not 100% positive but i believe it is the third choice

Which equation is not an identity?tan (-t) = - tan ttan t (csc t + cot t) = sec t + 1sin tcot t = cos tcos2t - sin2t = - 1