Table of contents 
Definitions and Formulas 
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An equation with trigonometric ratios of an angle θ, which is true for all values of ‘θ’, for which the given trigonometric ratios are defined, is called an identity.
Three fundamental trigonometric identities are
(a) sin^{2}θ + cos^{2}θ = 1
(b) sec^{2}θ = 1 + tan^{2}θ
(c) cosec^{2}θ = 1 + cot^{2}θ
Table: Values of trigonometric ratios of 0°, 30°, 45°, 60° and 90°
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