Use trigonometric identities to solve each equation within the given domain. If you can explain it that would be best, I want to know how to actually do it. Thanks!

Which expression is equivalent to? assume x > 0 and y > 0.

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Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.