6 ft person casts 18 ft shadow
x ft tree casts 20 ft shadow
6*20 = 18x
120 =18x
x=120/18
×≈6.67
43.778 subtracted by 77.2=-33.422
hope this helps :)
Answer:
f(x) ----> -f(x).
Step-by-step explanation:
We need to multiply the function by -1 (make it negative).
So -f(x) is the image of f(x) over the x-axis.
If you have some knowledge of complex numbers: This follows pretty much immediately from Euler's formula and DeMoivre's theorem,
(Euler)
(DeMoivre)
so that is the imaginary part of the expanded left hand side.
If that's unfamiliar to you, you can make use of several identities to expand :
(double angle sine)
(double angle sine and cosine)
(Pythagorean)