Answer:
4x-5y=4
X+2y=-12
4x+8y=-48
4x-5y-(4x+8y)=4-(-48)
4x-5y-4x-8y=52
-13y=52
y=(-4)
X+(2×-4)=-12
X+(-8)=(-12)
X=(-4)
Answer: (2,-3)
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
