已知(sinα-cosα)/(sinα+cosα)=1/3,则cos(π/3+α)的四次方-cos(π/6-α)的四次方的值为
已知(sinα-cosα)/(sinα+cosα)=1/3,则cos(π/3+α)的四次方-cos(π/6-α)的四次方的值为
数学人气:474 ℃时间:2019-11-09 06:10:31
优质解答
(sinα-cosα)/(sinα+cosα)=1/3sinα=2cosα (cosα)^2=1/5cos(π/3+α)的四次方-cos(π/6-α)的四次方=[cos(π/3+α)]^4-[sin(π/3+α)]^4={[cos(π/3+α)]^2-[sin(π/3+α)]^2}*{[cos(π/3+α)]^2+[sin(π/3+α)...
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