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OpenStudy (thatonegirl_):
Idk what I keep doing wrong.. Find the exact values of sin2a, cos2a, and tan2a. Sina=-2/3, π
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rishavraj (rishavraj):
sin a = -2/3 |dw:1432081708124:dw|
OpenStudy (thatonegirl_):
But how do i plug it into the double-angle formula?
OpenStudy (thatonegirl_):
Dw dw no one knows how to do this crap -.-
rishavraj (rishavraj):
sin (2a) = 2sin a cos a cos 2a = 2cos^2 a - 1
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