Question

What does `4sin(arccos(2))+2cos(arcsin(6))` equal?

Answer 1

Invalid expression.

Explanation:

Arc cos 2 is an angle whose cosine is 2. But cosine value cannot

exceed 1., So, this is invalid. For the same reason, arc sin 6 is invalid.

`|sin a| in [-1, 1]` and, likewise, `|cos a| in [-1, 1]`.