Write the following expression as the sine, cosine, or tangent of a double-angle. Then find the exact value of the expression 2 tan 3pi/8. cos2 - 8 cos - 1 = 0
Write the following expression as the sine, cosine, or tangent of a double angle.
A. 2 cos 23 pi/8 - 1 = cos.
B. 2 cos 23 pi/8 - 1 = tan.
C. 2 cos 23 pi/8 - 1 = sin.
Find the exact value of the expression.
A. The exact value of the given expression is.
B. The value the given expression is undefined.