137-138 Derivatives of Trig Functions

To find the derivative of sin(x), they drew tangent lines to sin(x) (printed out on paper), measured their slopes and then graphed the derivative point by point. Here’s a desmos version.

From that derivative fact and noticing that the derivative of cos(x) is -sin(x), they have enough to find the derivatives of tan(x), csc(x), sec(x), and cot(x). Let them at it.




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