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Explain that sintheta and costheta are p...

Explain that `sintheta` and `costheta` are periodic functions.

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A periodic function is one whose value repeats after a definite interval of time `Sintheta ` and `costheta` both are the periodic functions because
`sin(theta+2pin)=sintheta`
and `cos(theta+2pin)=costheta`
where `n=1,2,3….`
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