Answer:
a = -10
Step-by-step explanation:
x=π/2 ,3π/2
cot x(csc x+1)=0
either cot x=0
tanx=∞=tan (π/2)
x=π/2
or csc x=-1
or sin x=-1=-sin (π/2)=sin (π+π/2)=sin (3π/2)
x=3π/2
5x-7+8=-27
y=K/4z
K=4yz
