Problem 13.3. Calculate the following trigonometric indefinite integrals (antiderivatives): (1) f sin (x) cos(x) dr. (2) f sin (2r) cos(2r) dr. (3) f sin (r) cos(2a) dx. (4) J sin (x) dr. (5) f sin (r) dr. (6) S cos (2x) dr. (7) S cos (2ar) dr.

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