Answer:
30 hours
Step-by-step explanation:
30+45x=60+45x
45x=30+45x
x=30
Answer:
18
Step-by-step explanation:
Answer:
1/6 4/9 1/3 1/2
Step-by-step explanation:
The value of x would be 114°
Hello,
cos 2t=2cos²t-1
2cos 2t -cos t-1=
==>2(2cos² t -1)-cos t-1=0
==>4cos² t -cos t -3=0
Δ=(1+4*4*3=49=7²
cos t= (1+7)/8 or cos t=(1-7)/8
cos t =1 or cos t=-3/4
t=0° or t=138.590377...°
