Taking Rhs
1/2 [sin(x+y)+ sin (x-y)]
using sinA + sin B = 2 cos (A+B)/2 cos( A - B)/2
1/2 [ 2 Cos ( x+y+x-y)/2 . Cos (x+y-x+y)/2]
=Cos 2x/2. Cos 2y/2 = Cos x . Cos y
Hence true
Answer:
C, 14.28
Step-by-step explanation:
area = base * height
= (1.9+3.2) * 2.8
=14.28
3x^2+7x+4
Use the FOIL method, 3x•x +3x•1+4•x+4•1
3x^2+7x+4
Answer:
x=10/3
Step-by-step explanation:
hope that helps
Answer:$3.25
Explanation:
Since the 7 min phone call is at 1.75, that means that one minute of phone call time is 0.25. 13 minutes would be 0.25*13=3.25
hope this helps
