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Trigonometric Expression

\frac{1 + cos x}{sin x}

Trigonometric Equation

2 sin x = 3

Double-Angle Identity

cos (2 x)

Pythagorean Identity

sin^{2} x + cos^{2} x

\frac{sin 4 5 ^{\circ}}{5} = \frac{sin 6 0 ^{\circ}}{x}

c^{2} = a^{2} + b^{2} - 2 ab cos C