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Free Calculus Derivatives of Trig Functions worksheet from mathworksheets4kids.com
Calculus practice problems, reference, and step-by-step problem solver from cymath.com
Derive and prove basic trig function derivatives. Find helpful interactive exercises at themathpage.com
Applications of trigonometry function derivatives are at intmath.com
"The Cos y function" by Spiked Math (#577 - 4-15-15)