Question

evaluate cot (cos^-1(-15/17))

Answer 1

Use the relation:
\[1+\cot^2x=\frac{1}{1-\cos^2x}\]In this case,
\[\cos x=-15/17\]So,
\[1+\cot^2x=\frac{1}{1-(15/17)^2}\]Solve for cot x.