Trigonometry · Self-Study

sin · cos · tan

20 carefully selected problems — from foundations to tricky word problems. Test your understanding and learn from every mistake.

Memory anchors — read before you start

SOH
sin θ = Opposite / Hypotenuse
CAH
cos θ = Adjacent / Hypotenuse
TOA
tan θ = Opposite / Adjacent
ASTC
All · Sin · Tan · Cos — quadrant signs
sin²+cos²=1
Pythagorean identity — always true
tan = sin/cos
Quotient identity — very useful
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