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)
D hope its help you if not sorry
We have been given a function 
represents the cost in dollars a company incurs when producing x items during a month. We are asked to find the cost to produce 50 items.
To find the cost to produce 50 items, we will substitute 
in our given function as:
Therefore, it will cost $20,000 to produce 50 items.
28÷4=?? An expression is just a number sentence without the answer. BTW the answer is 7, but just write 28÷4=?
Answer) Od
(a+b)2 =a2+2ab+b2
