Is x^4−4x^3+8x^2+2x−13 a polynomial

Which triangles area would be calculated using the trigonometric area formula

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.

Can anyone me with 32,33,36,37,and 40.