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cos平方a+sin{π/2+2a}=cos²;a+cos(2a)=cos²;a+cos²;a-sin²;a=(2cos²;a-sin²;a)/(cos²;a+sin²;a)=(2-tan²;a)/(1+tan²;a)=1/2故1+tan²;a=4-2tan²;a3tan²;a=3tan…
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