What is the exact value of sin 165⁰?

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Which of these choices show a pair of equivalent expressions?

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²