Section 5 Mathematical Formulas

5-1 Trigonometric Function

5-1-2 Symmetric Property

Symmetric with respect to $\theta=0$(x-axis)	Symmetric with respect to $\theta=\pi/4$	Symmetric with respect to $\theta=\pi/2$(y-axis)
$sin(-\theta)=-sin\theta$	$sin(\frac{\pi}{2}-\theta)=+cos\theta$	$sin(\pi-\theta)=+sin\theta$
$cos(-\theta)=+cos\theta$	$cos(\frac{\pi}{2}-\theta)=+sin\theta$	$cos(\pi-\theta)=-cos\theta$
$tan(-\theta)=-tan\theta$	$tan(\frac{\pi}{2}-\theta)=+cot\theta$	$tan(\pi-\theta)=-tan\theta$

　　　　　

　　　　　

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