Answer:
cos(π/3)cos(π/5) + sin(π/3)sin(π/5) = cos(2π/15)
Step-by-step explanation:
We will make use of trig identities to solve this. Here are some common trig identities.
Cos (A + B) = cosAcosB – sinAsinB
Cos (A – B) = cosAcosB + sinAsinB
Sin (A + B) = sinAcosB + sinBcosA
Sin (A – B) = sinAcosB – sinBcosA
Given cos(π/3)cos(π/5) + sin(π/3)sin(π/5) if we let A = π/3 and B = π/5, it reduces to
cosAcosB + sinAsinB and we know that
cosAcosB + sinAsinB = cos(A – B). Therefore,
cos(π/3)cos(π/5) + sin(π/3)sin(π/5) = cos(π/3 – π/5) = cos(2π/15)
Answer:
17,453.30 feet
Step-by-step explanation:
Answer:
what is x
Step-by-step explanation:
The slope is 5/2
The slope formula is:
m = y2 - y1 / x2 - x1
Our points are:
(-1, 4) and (1, 9)
Just insert them into the formula and simplify to get your answer:
m = 9 - 4 / 1 + 1
m = 5/2
Answer:
It's B
Step-by-step explanation:
