f(1)=1/4,4f(x)*f(y)=f(x+y)+f(x-y),x,y属于R,则f(2010)=?如题,构建三角函数,
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![f(1)=1/4,4f(x)*f(y)=f(x+y)+f(x-y),x,y属于R,则f(2010)=?如题,构建三角函数,](/uploads/image/z/13323300-60-0.jpg?t=f%EF%BC%881%EF%BC%89%3D1%2F4%2C4f%28x%29%2Af%28y%29%3Df%28x%2By%29%2Bf%28x-y%29%2Cx%2Cy%E5%B1%9E%E4%BA%8ER%2C%E5%88%99f%282010%29%3D%3F%E5%A6%82%E9%A2%98%2C%E6%9E%84%E5%BB%BA%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%2C)
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