To find the volume of a cone use this formula:
V =
V≈167.55
Step-by-step explanation:
7-3cosx=9sin²x
[sin²x=1-cos²x]
=>
7-3cosx=9-9cos²x
=>
9cos²x-3cosx-2=0
=>
let cosx=t
9t²-3t-2
by quadratic formula,
t=(3±9)/2·9
=> t=2/3 or t=-1/3
thus,
x=acos(2/3) or x=π- acos(1/3)
The formula is n/2(a1+an). n is the number of terms. a1 is the first value in the sequence and an is the value of the sequence at the nth term
Answer:
No solution
Step-by-step explanation:
Not sure tbh