Ocegik / Trigonometry
Trigonometry Formulas for CAT Preparation
Revise trigonometry formulas from Ocegik’s formula library, with named identities, expressions and usage notes grouped by topic.
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Read the formulas by topic and check the conditions and usage notes before applying them.
Trigonometry: formulas by topic
Trigonometric Ratios & IdentitiesTrigonometry
Angle conversionπ radians = 180°
sin θ= Height / Hypotenuse
cos θ= Base / Hypotenuse
tan θ= Height / Base = sin θ / cos θ
Pythagorean identitysin2θ + cos2θ = 1
Secant identity1 + tan2θ = sec2θ
Cosecant identity1 + cot2θ = cosec2θ
Standard Angle ValuesTrigonometry
0°, 30°, 45°, 60°, 90° — sin, cos, tan0°sin = 0, cos = 1, tan = 0
30°sin = 1/2, cos = √3/2, tan = 1/√3
45°sin = 1/√2, cos = 1/√2, tan = 1
60°sin = √3/2, cos = 1/2, tan = √3
90°sin = 1, cos = 0, tan = ∞
Quadrant signs ("School After To College")QI: all + · QII: sin,cosec + · QIII: tan,cot + · QIV: cos,sec +
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