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Precalc
Precalc terms and formulas to know
Question | Answer |
---|---|
Pythagorean Identities | (sin^2x)+(cos^2x)=1 (tan^2x)+1=(sec^2x) (cot^2x)+1=(csc^2x) |
Double Angle Formula | (sin2θ)=(2sinθ)(cosθ) (cos2θ)=(cos^2θ)-(sin^2θ) =(2cos^2θ)-1 =1-(2sin^2θ) |
Factoring: a^2-b^2 Difference of Perfect Squares | a^2-b^2=(a-b)(a+b) |