Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §4.4 Inverses of Trigonometric Functions, #9 · Calculus · Differentiation rules

If … find a formula for

If $y = cos x$ find a formula for $sin x$ . First draw a right triangle with angle $x$ and near side $y$ —what are the other two sides?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §4.4 Inverses of Trigonometric Functions, #9

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