Hi,
Equation;

Variable n is given so no need to write it down. Instead use 8.
Solving:

Hope this helps.
r3t40
12^3 / 12^7 = 12^3-7
= 12^-4
Answer:
Can u send a more clear pic
Step-by-step explanation:
thankyou
<span>x in (-oo:+oo)
(8/9)*x = (4/9)*x+8 // - (4/9)*x+8
(8/9)*x-((4/9)*x)-8 = 0
(8/9)*x+(-4/9)*x-8 = 0
4/9*x-8 = 0 // + 8
4/9*x = 8 // : 4/9
x = 8/4/9
x = 18
x = 18
</span>
Cos2x = (cosx)^2-(sinx)^2 so if you have the minus before you have to inverse sign: (sinx)^2-(cosx)^2= -cos2x