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OpenStudy (anonymous):
if sin A=4/5 w A in QII, find the value of sin2A
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OpenStudy (anonymous):
Use double-angle formula for sin2A sin 2A = 2 sin A cos A You know sin A, you need to find cos A.
OpenStudy (anonymous):
i came up with 2(4/5)(-3/5) = -24/25...can someone verify
OpenStudy (campbell_st):
looks good to me
OpenStudy (anonymous):
thanks
OpenStudy (anonymous):
Looks great to me.
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