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QUESTION
How do you simplify ##(1-cos^2x)/sinx##?
Use ##cos^2 x + sin^2 x = 1## to find:
##(1-cos^2 x)/(sin x) = sin x##
Since ##cos^2 x + sin^2 x = 1##, we find:
##(1-cos^2 x)/(sin x) = (sin^2 x)/(sin x) = sin x##
