Answer:
x = 2 
Step-by-step explanation:
Since the triangle is right we can use the sine ratio to find x
sin60° = 
= 
[ note the exact value of sin60° = 
], hence
= 
multiply both sides by 2x, hence
x = 2
divide both sides by
x = 
= 2
= 2
Answer:
steps below
Step-by-step explanation:
Are you going to solve the value of A or just a proof the equation
cos 2A = cos² A - sin² A
2cos²A-cos2A-1 = 2cos²A - (cos² A - sin² A) - 1 = cos² A + sin² A - 1
2cos²A-cos2A-1 = 1 - 1 = 0
A: 90° or 270° or 450° .....
Answer:
A≈78.54cm²
Step-by-step explanation:
11/3 x 21/2 = 77/2
Factor all the numbers into primes and then cancel same numbers that are on the top and bottom.
