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6. Find the exact value of sin (cos '(-) + sin '(1)) . Hint: sin(a + 8) = sina cos B + cosa sin B
6. Find the exact value of sin (cos '(-) + sin '(1)) . Hint: sin(a + 8) = sina cos B + cosa sin B where o = cos '(-;) and B = sin (). Note: Do not use a calculator to evaluate it. 7. Evaluate / xv2 -rdx. Hint: Apply the method of u-substitution. 8. Evaluate sin r dr. Hint: Use an appropriate trigonometric identity
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