tolong di jawab yah buat remedial

1. f(x)= (2x-12)/(8x +12)
f ⁻¹ { (2x -12)/(8x+12)} = x
f⁻¹ (-5)= .

(2x -12)/(8x+12) = - 5
2x -12 = - 5(8x +12)
2x -12 = -40x - 60
2x + 40 x = - 60 + 12
42 x = - 48
x = - 48/42
x= - 8/7

2. fog(x)= f(g(x))= f(2-4x)
(fog)(x)= 12(2 -4x) + 3
(fog)(x) = 24 -48x + 3
(fog)(x) = -48x + 27
(fog)⁻¹(- 48x + 27)= x
(fog)¹(-10)= ...
-48 x + 27 = -10
- 48x  = -37
x =  37/48

3.  ΔPQR siku siku di Q
PQ = 6√3
QR = 4
PR = √(PQ²+QR²) = √124 = 2√31

sin P = QR/.PR = 4/(2√31) = 2/31 √31
sec P = PR/PQ = 2√31 /6√3  = 1/9 √93
cos R = QR/PR = 2/31 √31
cot R = QR/PQ  = 4/(6√3) = 2/9 √3