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In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables where both sides  ...


Reciprocal identities. displaymath161. Pythagorean Identities. displaymath162. Quotient Identities. displaymath163. Co-Function Identities. displaymath164.


Lists the basic trigonometric identities, and specifies the set of trig identities to keep track of, as being the most useful ones for calculus.


Trig Identities. Identities involving trig functions are listed below. Pythagorean Identities. sin2 θ + cos2 θ = 1. tan2 θ + 1 = sec2 θ. cot2 θ + 1 = csc2 θ ...


You have seen quite a few trigonometric identities in the past few pages. It is convenient to have a summary of them for reference. These identities mostly refer to ...


Rewrite trigonometric expressions using the Pythagorean identity and other trigonometric identities.


Look up AND understand all your favorite trig identities.


sin(theta) = a / c. csc(theta) = 1 / sin(theta) = c / a. cos(theta) = b / c. sec(theta) = 1 / cos(theta) = c / b. tan(theta) = sin(theta) / cos(theta) = a / b. cot(theta) = 1/ ...


Pythagorean identities. Sum and difference formulas. Double angle formulas. Half angle formulas. Products as sums. Sums as products.