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If ? is in the first quadrant and cos ? = 3/5 , what is sin(1/2 ?)? Determine your answer without using a calculator. Rationalize

If ? is in the first quadrant and cos ? = 3/5 , what is sin(1/2 ?)? Determine your answer without using a calculator. Rationalize the denominator if necessary. 19 sin (1/2?) = [?]

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