What is the period of y equals cosx?

Updated: 8/20/2019
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9y ago

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The period is 2*pi radians.

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Q: What is the period of y equals cosx?
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When are y equals sin x and y equals cos x equal?

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From the Pythagorean identity, sin2x = 1-cos2x. LHS = 1/(sinx cosx) - cosx/sinx LHS = 1/(sinx cosx) - (cosx/sinx)(cosx/cosx) LHS = 1/(sinx cosx) - cos2x/(sinx cosx) LHS = (1- cos2x)/(sinx cosx) LHS = sin2x /(sinx cosx) [from Pythagorean identity] LHS = sin2x /(sinx cosx) LHS = sinx/cosx LHS = tanx [by definition] RHS = tanx LHS = RHS and so the identity is proven. Q.E.D.

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Does sin x tan x plus cos x equals tan x?

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