证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x_英语解答

证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x

人气：225 ℃　时间：2020-06-18 19:08:17

解答

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...