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所谓三角条件恒等式,就是在给定条件所包含的一切情况下都成立的三角等式.因此,证明三角条件恒等式时,必须证明该三角等式在给定条件所包含的一切情况下都成立;如果只
The so-called trigonometric conditional identity is a trigonometric equation that holds for all conditions contained in a given condition. Therefore, when proving a trigonometric conditional identity, it must be proved that the trigonometric equation is true under all conditions contained in a given condition. If only