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Pre-Calculus/ Trigonometry

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Here are some helpful formulas that you might need to know on your journey to Pre-Calculus

In a right triangle, with sides a and b, and hypotenuse c
Sin(x)=a/c or b/c depending on the angle
Cos(x)=b/c or a/c depneding on the angle
Tan(X)= a/b or b/a depending on the angle
The best way to remember these formulas is SOH, CAH, TOA
Sin= Opposite/Hypotenuse
Cos= Adjacent/Hypotenuse
Tan= Opposite/Adjacent
sin(2x) = 2 sin x cos x
sin^2(x) + cos^2(x) = 1
tan^2(x) + 1 = sec^2(x)
cot^2(x) + 1 = csc^2(x)

Illustration: In the schoolyard

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