Use trigonometric identities to simplify the expression. 1/sin(t)csc(-t)  or  1 *over* sin(t)csc(-t)

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A: Topic = Derivative

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A: I am attaching image so that you understand each and every step.

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A: I am attaching image so that you understand each and every step.

Q: 5. Prove that if f(z): then f is an entire function. COS Z z² - (π/2)² J when zл/2, when z = : ±л/2,

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A: To find the given trigonometric functions.