Frequently Asked Questions
What is SOH-CAH-TOA?
A mnemonic for right-triangle ratios: Sin = Opposite/Hypotenuse, Cos = Adjacent/Hypotenuse, Tan = Opposite/Adjacent.
When do I use degrees vs radians?
Degrees for everyday angles, navigation, and construction. Radians for calculus and physics - sin and cos derivatives only equal cos and −sin in radians.
What does it mean to take an inverse trig function?
arcsin(x) returns the angle whose sine is x. Calculators give principal values: arcsin returns −90° to 90°, arccos 0° to 180°, arctan −90° to 90°.
Why is tan(90°) undefined?
Because tan = sin/cos, and cos(90°) = 0. Division by zero is undefined; tan approaches ±infinity as the angle approaches 90°.
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