利用辛变换条件得到了一些新的切比雪夫多项式公式、三角恒等式和双曲恒等式。
In this paper by using the symplectic transformation condition, some new formulas including Chebyshev Polynomial, trigonometric identity, hyperbolic identity were obtained.
不必去记住几何上的证明和三角恒等式，虽然那确实是高中学校要求你必须去做的。
No need to dive right into memorizing geometric proofs and trigonometric identities. But that's exactly what high schools have you do.
不必去专研记住几何上的证明和三角恒等式，虽然那确实是高中学校要求你必须去做的。
No need to dive right into memorizing geometric proofs and trigonometric identities. But that's exactly what high schools have you do.
不必去钻石记住几何上的证明和三角恒等式，虽然那确实是高中学校要求你必须去做的。
No need to dive right into memorizing geometric proofs and trigonometric identities. But that's exactly what high schools have you do.
利用基本三角恒等式、物理学中几何光学知识和几何画板软件等三种思维方法，来探讨一个最短时间问题的解法。
The author explores the solution to the best time problem according to three ways of thinking, including basic trigonometric identity, geometrical optics of physics and Geometer's Sketchpad.
我亲眼目睹有人发布有关微积分和三角法的恒等式难题，并迅速得到别人的解答。
I've seen people post Calculus and Trigonometry equations and get them solved fairly quickly!
我亲眼目睹有人发布有关微积分和三角法的恒等式难题，并迅速得到别人的解答。
I've seen people post Calculus and Trigonometry equations and get them solved fairly quickly!
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