sin(a+45度)=3/5 求sina的值
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sin(a+45度)=3/5 求sina的值
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sina+cosa=1/5、sin²a+cos²a=1,=>sin²a+(1/5-sin²a)=1,=>sin²a+(1/5-sin²a)=1sin²a-(2/5)sina+(1/25)+sin²a=12sin²a-(2/5)sina-(24/25)=025sin²a-5sina-12=0(5sina+3)(5sina-4)=