证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x
题目
证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x
答案
Notice thattan²(x) = sin²(x) / cos²(x) .Using this on the right-hand side of the equation and gathering into a common fraction,we gettan²(x) - sin²(x) = (sin²(x) / cos&su...
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