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Answer to Question #1613 in Algebra for aakriti goel

Question #1613
Explain why the sin(theta) and cos(theta) are periodic functions?
Expert's answer
From the definition of the periodic function,
f(x) = f(x+kT), where k=0,1,2,3,... and T is the period.
cos (θ) = cos(θ +k 2π)
sin(θ) = sin(θ + k 2π)
2π is the period of cos and sin.

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