find the tangent and normal to the curve at the indicated point
y' = -csc²(x) + 2*csc(x)*cot(x)
y'(pi/2) = -1
Eqn of tangent line:
y - 2 = -1(x - pi/2)
y = -x + pi/2 + 2
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y' = -csc²(x) + 2*csc(x)*cot(x)
y'(pi/2) = -1
Eqn of tangent line:
y - 2 = -1(x - pi/2)
y = -x + pi/2 + 2