Sin a cos a = sin a cos^2 a is not an identity. which of the following values proves that this is not an identity? a) 0 degrees
b) 90 degrees
c) 135 degrees
d) 270 degrees

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.

What is the approximate value of  q  in the equation below? –1.613–1.5220.5853.079

Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). −5x3 + 11x2 − 2 5x3 − 11x2 + 2 x3 + 2x2 + x3 x3 − 2x2 − x3