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Trigonometry 11 Online
OpenStudy (anonymous):

if sin A=4/5 w A in QII, find the value of sin2A

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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