(adsbygoogle = window.adsbygoogle || []).push({}); physics textbook, replace sine with its definition (???)

What on earth do they mean?

"That will introduce either sin(theta) or cos(theta). Reduce the resulting two variables, x and theta, to one, x, by replacing the trigonometric function with an expression (its definition) involving x and y."

Replace sin(theta) with a function of x and y? What?

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# Physics textbook, replace sine with its definition (?)

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