Question

Rewrite each expression as an algebraic expression in terms of x.
a) tan(arccosx)
b) sin(2cos^-1(x))
c) tan(arccosx)

Answer 1

a. Hint: use: tanx = sinx/cosx and sin²x+cos²x=1

Answer 2

b. Do you mean:\[\cos^{-1} x = \frac{ 1 }{ \cos x }\]or\[\cos^{-1} x=\arccos x\]???