Trigonometric EquationHard

Question

|sin x| dx is

Options

A.20
B.8
C.10
D.18

Solution

|sin x| dx = 10 sin x dx + sin x dx
= 10 × [cosx]0π/2 + [cos x]ππ/2 ; 10[1 + 1] = 10 × 2 = 20

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