Why Does Cos 2 + Sin 2 Equal 1

How do you differentiate sin and cos graphs? Sin^2(x) + cos^2(x) Cos^-1(x) = sec^-1(1/x)

$trigonometry - Why $\sin(n\pi) = 0$ and $\cos(n\pi)=(-1)^n$

trigonometry - Why $\sin(n\pi) = 0$ and $\cos(n\pi)=(-1)^n

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Why sin 2x = 2 sin x cos x

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