(cos9^@+sin9^@)/(cos9^@-sin9^@)= (a) tan...

`(cos9^@+sin9^@)/(cos9^@-sin9^@)=` (a) `tan 54^@` (b) `tan 36^@` (c) `tan18^@` (d) None of these

A

tan `54^@`

B

tan `36^@`

C

tan `18^@`

D

tan`9^@`

Verified by Experts

The correct Answer is:

A

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