Single-Variable Calculus

Essential Trigonometry

(A)

\sin (- θ) = - \sin θ

(B)

\sin (π - θ) = \sin θ

\cos (- θ) = \cos θ

\tan (- θ) = - \tan θ

(C)

\sin (π + θ) = - \sin θ

\cos (π + θ) = - \cos θ

\tan (π - θ) = - \tan θ

(D)

\sin (2 π + θ) = \sin θ

\cos (2 π + θ) = \cos θ

\tan (π + θ) = \tan θ

(E)

\sin (\frac{π}{2} - θ) = \cos θ and \sin (θ - \frac{π}{2}) = - \cos θ

\cos (\frac{π}{2} - θ) = \sin θ

t a n (\frac{π}{2} - θ) = \sin θ

t a n (\frac{π}{2} - θ) = c o t θ