Answer:
24
Step-by-step explanation:
The corner with the square means its a 90 degree angle so 90-66=24
The first prime numbers are 1 and 3 ,5,7,9 Added together the total is 25
3. First factor as a difference of cubes:
For the remaining group, apply the double angle identity.
5. seems rather tricky. You might want to post another question for that problem alone...
6. Factorize the left side as a sum of cubes:
From here we have to prove that
We can write everything in terms of sine:
(double angle identity)
(angle sum identity)
After some simplifying, we're left with showing that
or
This last equality follows from what you could the triple angle identity for sine,
X² + 2x +3
If the discriminent Δ = b²-4.a.c <0 , that means the roots (or the zero value) are nit REAL Number (they are imaginary or complex)
Δ = 2² - 4(1)3) = 4 - 12 = -8
since Δ = - 8 < 0 there are no real roots
My understanding it would be letter ( i ) because it is imaginary.