Trig identity:tan=sin/cos,高中知识，两边同时乘cos Sin=tan*cos
Re: Prove the trig identity cosx/(secx+tanx)= 1-sinx Murray 30 Dec 2015, 03:12 When you see a mix of trigonometric ratios, try converting everything to just sin, cos and/or tan.Re: Prove the trig identity cosx/(secx+tanx)= 1-sinx Alexandra 31 Dec 2015, 04:08 LHS=cos...
https://socratic.org/questions/how-do-you-verify-the-identity-cosx-1-sinx-1-sinx-cosx Wrong identity Explanation: This is a wrong identity. After cross multiplication --> cos2x can't be equal to (1−sinx)2 更多结果 共享 复制 已复制到剪贴板 示例 二次方程式 x2...