f(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值 (2)求ff(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值(2)求f(x)的递减区间
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![f(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值 (2)求ff(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值(2)求f(x)的递减区间](/uploads/image/z/4110765-69-5.jpg?t=f%EF%BC%88x%EF%BC%89%3Dcos%5E2x-sin%5E2x%2C%EF%BC%881%EF%BC%89%E6%B1%82f%EF%BC%88pai%EF%BC%8F4%EF%BC%89%E7%9A%84%E5%80%BC%E5%8F%8Af%EF%BC%88x%EF%BC%89%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC+%EF%BC%882%EF%BC%89%E6%B1%82ff%EF%BC%88x%EF%BC%89%3Dcos%5E2x-sin%5E2x%2C%EF%BC%881%EF%BC%89%E6%B1%82f%EF%BC%88pai%EF%BC%8F4%EF%BC%89%E7%9A%84%E5%80%BC%E5%8F%8Af%EF%BC%88x%EF%BC%89%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82f%EF%BC%88x%EF%BC%89%E7%9A%84%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B4)
f(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值 (2)求ff(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值(2)求f(x)的递减区间
f(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值 (2)求f
f(x)=cos^2x-sin^2x,
(1)求f(pai/4)的值及f(x)的最大值
(2)求f(x)的递减区间
f(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值 (2)求ff(x)=cos^2x-sin^2x,(1)求f(pai/4)的值及f(x)的最大值(2)求f(x)的递减区间
f(x)=cos2x
(1)f(π/4)=cosπ/2=0 f(x)最大值=1
(2) 2kπ
f(pai/4)=cos²(pai/4)-sin²(pai/4)=1-1=0