sina+cosa=7/5,sina×cosa=?
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Sina+cosa=7/5
sina×cosa=?
(Sina+cosa)²=49/25
sin²a+cos²a+2sina.cosa=49/25
1+2sina×cosa=49/25
2sina.cosa=49/25-1
sina×cosa=24/25×2
sina×cosa=12/25
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