已知非零函數(shù)a.b滿足：(asin(π/5)+bcos(π/5))/(acos(π/5)-bsin(π/5))=tan8π/5,求b/a的值
已知非零函數(shù)a.b滿足：(asin(π/5)+bcos(π/5))/(acos(π/5)-bsin(π/5))=tan8π/5,求b/a的值
數(shù)學(xué)人氣：632 ℃時(shí)間：2020-06-05 13:31:14
優(yōu)質(zhì)解答
(asin(π/5)+bcos(π/5))/(acos(π/5)-bsin(π/5))=tan8π/5=tan3π/5=sin3π/5/cos3π/5asinπ/5cos3π/5+bcosπ/5cos3π/5=acosπ/5sin3π/5-bsinπ/5sin3π/5bcosπ/5cos3π/5+bsinπ/5sin3π/5=acosπ/5sin3π/5...
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