在直角三角形ABC中,∠C=90°,AB是∠C的对边c,BC是∠A的对边a,AC是∠B的对边b,正弦函数就是sinA=a/c,即sinA=BC/AB。
所推导的系数公式都属正弦函数形式。
Coefficient formulae derived belong to forms of the sine function.
目的研究正弦函数和余弦函数的一些计算公式。
Aim To study some calculation formula of sine function and cosine function.
泰勒级数的效率也无法与现代桌面芯片的内置正弦函数相比。
The Taylor series is also inefficient compared to the built-in sine function of a modern desktop chip.
Then you're supposed to know derivatives of simple functions like sines and cosines.
你应该知道一些简单函数的导数,比如正弦函数和余弦函数
I'm using the fact that when you take a cosine and change the angle inside the cosine, it doesn't care. whereas, if you go to the sine and change the angle inside the sine, it becomes minus sine.
我用了一个结论,当你使用余弦函数时,改变角度的正负,函数值不变,而对于正弦函数,改变角度的符号,则函数值也会变号
For example, this is x=t, x=t^, you're going to have x=sin t and cos t and log t.
例如,这是x=t,x=t^,你还会遇到正弦,余弦,对数函数
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