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sina=3cosa/2因為sin²;a+cos²;a=1則13cos²;a/4=1cos²;a=4/13sin²;a=9/13所以sin²;acos²;a=36/169sincosa=±6/13sina=3cosa/2所以sina和cosa同號所以sinacosa>0則sin2a=2sinacosa=12/13…
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