Section 5 Mathematical Formulas

5-1 Trigonometric Function

5-1-3 Movement & Periodicity

movement of $\pi/2$	movement of $\pi$	movement of $2\pi$
$sin(\theta+\frac{\pi}{2})=+cos\theta$	$sin(\theta+\pi)=-sin\theta$	$sin(\theta+2\pi)=+sin\theta$
$cos(\theta+\frac{\pi}{2})=-sin\theta$	$cos(\theta+\pi)=-cos\theta$	$cos(\theta+2\pi)=+cos\theta$
$tan(\theta+\frac{\pi}{2})=-cot\theta$	$tan(\theta+\pi)=+tan\theta$	$tan(\theta+2\pi)=+tan\theta$

　　　　　

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