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OpenStudy (anonymous):
cos x + (sin x)(tax x) = sec x. I need to show that this is an identity.
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OpenStudy (anonymous):
tan x = sin x/cos x so sin x tan x = sin^2x / cosx so cos x +sin x tan x = cos x +(sin^2x)/cos x = (cos^2x +sin^2 x)/cos x
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