The Derivatives of Trigonometric Functions - Exercise 1
Exercise 1. Find the equations of the tangent line and the
normal line to the graph of
Answer. First we need to find the derivative of f(x) so
we can get the slope of the tangent line and the normal line. We
So we have
So the equation of the tangent line at the point
the slope of the normal line to the graph at the point
which helps us find the equation of the normal line as
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