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- To prove cos (-u) csc (-u) tan (-u) = 1, which of the following is correct as a first step? a. cos (-u) csc (-u) tan (-u) = cos u (-csc u) (-tan u)b. cos (-u) csc (-u) tan (-u) = -cos u (csc u) (-tan u)c. cos (-u) csc (-u) tan (-u) =cos u (csc u) (tan u)d. cos (-u) csc (-u) tan (-u) = cos u (-csc u) (tan u)On Section 3.6, question 25. I do not understand what rule is used to convert derivative sin 3t to (cos 3t*3) or why the derivative for cos 5t is (-sin 5t *5)? So I can't figure out the problem. Can you help?What is the exact value of 2sin(x/2) * cos(x/2) if sin of x = 3/5 and cos of x = 4/5 ?