三角函数万能公式是什么
(sinα)^2 + (cosα)^2 = 1；1 + (tanα)^2 = (secα)^2；1 + (cotα)^2 = (cscα)^2；在任意非直角三角形中，均存在 tanA + tanB + tanC = tanAtanBtanC
(sinα)^2 + (cosα)^2 = 1；1 + (tanα)^2 = (secα)^2；1 + (cotα)^2 = (cscα)^2；在任意非直角三角形中，均存在 tanA + tanB + tanC = tanAtanBtanC
