Question 3(10 points)

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Prove the following identities:

(If it is a one step problem please state the formula used)

Question 3 options:

a)cos (x + pi/2) = -sin(x)

b)(sin (x) + cos (x))² =1 + sin(2x)

c)2csc (2x) = sec (x) csc (x)

d)sin (x + y)/ sin (x- y) = tan (x) + tan (y)/ tan (x) - tan (y)

e)sec (-t)/ tan (-t) = -csc(t)