Proof cot a/2 = 1+cos a/sin a ??

See below.

Step-by-step explanation:

tan a/2 = sin a / (1 + cos a)

cot a/2 = 1 / tan a/2

= 1 /   sin a / (1 + cos a)

=  (1 + cos a) / sin a.

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.

the answer to question 1 is -8, 28.

step-by-step explanation: