Question

How do you evaluate `-1 - cos^2(74) - sin^2 (74)`?

Answer 1

Factor out `-1`:

`=-(1 +cos^2(74^@) + sin^2(74^@))`

Recall the Pythagorean identity `cos^2x + sin^2x = 1`.

`=-(1 + 1)`

`=-2`

Hopefully this helps!