Question: help please D Question 9 Use various trigonometric identities to simplify the expression then integrate. Jan20 Cos 50 do O -1. sin 50 - -
help please

D Question 9 Use various trigonometric identities to simplify the expression then integrate. Jan20 Cos 50 do O -1. sin 50 - - sin 30 - - sin 70 + C 1. sin 50 - _ sin 70 - sin 38 + C 1. sin 30 - - sin 50 - - sin 70 + C 1 sin 50 - - sin 30 - - sin 70 + C
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