Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §7.2 Trigonometric Integrals, #56 · Calculus · Techniques of integration

Show that … and find the correct phase angle

Show that $a cos x + b sin x = a^{2} + b^{2} cos (x - α)$ and find the correct phase angle $α$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §7.2 Trigonometric Integrals, #56

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