Question

cos² 45° − sin² 90°

Options

• 0

• `1/2`

• `− 1/2`

• 1

Answer 1

`bb− bb1/bb2`

Explanation:

cos 45° = `1/sqrt2 = (1/sqrt2)^2 = 1/2`

sin 90° = 1 = 1² = 1

`1/2 − 1 = − 1/2`