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OpenStudy (anonymous):
sin(2cos^-1(-3/5)) exact value is
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OpenStudy (tkhunny):
Please draw a right triangle. Label an acute angle. This is the REFERENCE angle. We'll need to remember that we're in Quadrant II Label the Adjacent leg '3' Label the hypotenuse 5 Calculate the measure of the opposite leg. Apply the identity for the sine of twice an angle. You're almost done.
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