Trig Function Sum Formula
Trig Function Sum Formula. In this lesson, formulas involving the sum and difference of two angles will be defined and applied to the fundamental trig functions. Continuing with trig identities, this page looks at the sum and difference formulas, namely sin(a ± b), cos(a ± b), and tan(a ± b).
Unlike the sin(30) which can be expressed as ½, the sin(105) however, the angle sum formula allows you to represent the exact value of this function. For example, a version marker of 2013 indicates that this function is returns the sum of a power series based on the formula. Examples of using the sum and difference formulas.
Remember one, and all the rest flow from it.
Identities expressing trig functions in terms of their complements. Unlike the sin(30) which can be expressed as ½, the sin(105) however, the angle sum formula allows you to represent the exact value of this function. Note that sometimes you'll see the formula arranged differently; Sine, tangent, cotangent, and cosecant are odd functions while cosine and secant are even functions.
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