how-to-use-half-angle-identities-kristakingmath

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Like all trig identities, half-angle identities help us manipulate trig functions so that they're easier to evaluate. The reason that they're helpful is because we might not know how to find the value of a trig function with a particular argument. But we might easily know the value of half of the argument. So if we can use a half-angle identity to cut the angle in half, then we'll be able to quickly find the value of the entire trig function.

These particular identities are used less than some others, so they might not be worth memorizing. But they can still come in handy in some situtations.

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Tagged under: educational,precalculus, angle,-angle identities,trig identities, ,trig,calculus,trigonometry,Krista King,precalc

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