# Questions on Trigonometric Identities

Multiple choice questions on trigonometric identities with answers at the bottom of the page. ## Questions with Answers## Question 1Which of the following is not an identity?a) sin ^{2} a+cos^{2} a = 1
b) sin a = tan a * cos a c) 1 + cot ^{2} a = csc^{2} a
d) 1 - sec ^{2} a = tan^{2} a
## Question 2Which of the following is an identity?a) sin (a) cos (a) = (1/2) sin(2 a) b) sin a + cos a = 1 c) sin(-a) = sin a d) tan a = cos a / sin a ## Question 3^{2} t / sin t =
a) sin t b) csc t c) sec t d) cos t ## Question 4Which of the following is not an identity?a) tan(2 t) = 2 tan (t) b) sin ^{2} a = 1 - cos^{2} a
c) sin(-t) = - sin(t) d) sec(-t) = sec(t) ## Question 5Which of the following is an identity?a) sin ^{2} u = 1 + cos^{2} u
b) cot u = sin u * cos u c) sin ^{2} u = 1 - 1 / sec^{2} u
d) cos(-u) = - cos u ## Question 6a) -sin(x) b) sin (x) c) sec (x) d) cos (x) ## Answers- d)
- a)
- b)
- a)
- c)
- a)
## Links and ReferencesTrigonometry Problems |