已知a为锐角,sin(a+15º)=4÷5,求cos(2a-15º)
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已知a为锐角,sin(a+15º)=4÷5,求cos(2a-15º)
已知a为锐角,sin(a+15º)=4÷5,求cos(2a-15º)
已知a为锐角,sin(a+15º)=4÷5,求cos(2a-15º)