Answer:
The most straightforward way to obtain the expression for cos(2x) is by using the "cosine of the sum" formula: cos(x + y) = cosx*cosy - sinx*siny. cos(2x) = cos² (x) - (1 - cos²(x)) = 2cos²(x) - 1. = 2cos²(x) - 1.
Step-by-step explanation:
Answer:
8<em>x</em> + 25
Step-by-step explanation:
In the second photo.
That is 6 I believe
3 squared equals 9
9*2=18
18/3=6
Answer:
m = 5
Step-by-step explanation:
−4m + 5 = -15
-4m = -15 - 5
-4m = -20
m = 5