Question

How do you simplify `cos (arcsin x - arctan 2)`?

Answer 1

`cos [x - (63^@43 + k180^@)]`

Explanation:

arcsin x --> x
Calculator and unit circle give -->
tan y = 2 --> arctan 2 = y = 63^@43 + k180^@
The trig expression can be simplified as:
`cos [x - (63^@43+ k180^@)]`