Answer:
1) cos (3x)
2)
Step-by-step explanation:
Given expression:
cos(7x)cos(4x)+sin(7x)sin(4x)
By using the trigonometric identity
cos(a)cos(b) + sin(a)sin(b) = cos(a-b)
we have:
cos(7x)cos(4x)+sin(7x)sin(4x) = cos(7x - 4x)
= cos(3x)!
part 2:
tan (-π/12)
by using property tan(-x)= - tan(x)
=-tan(π/12)
= - tan(π/6 / 2)
Using tan(x/2) =
= -
cos π/6 =
= -
= -
= - 2+
=
!
Answer:
16
Step-by-step explanation:
6(3)-2
16
Answer:
option F
Step-by-step explanation:
given,
capacity of tank = 1000 gallon
volume of water leak = 300 gallon
time = 30 min
water is leaking at the rate
formula used
At t = 0 A = 1000 gallons
B = 1000
at t = 30 A = 700
taking ln both side
now,
hence, the correct answer is option F
Answer:
6
Step-by-step explanation:
-6+-2 is -8. if you add 14 its 6