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- tan=5/4, find sin2x from (180 to 270)Also, Cos Tan CotTo 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)