Question

What does `2sin(arc cot(4))-3sin(arc sin(2))` equal?

Answer 1

If a = arc sin(2), sin a = 2. But sine value cannot exceed 1. So, the given expression is invalid.

Explanation:

Let a = arc sin (2). Then. sin a = 2.
Strictly, `|sin a| <=1`. Here in the second term, sin a = 2 > 1..