Answer =
0.89
Step by step explanation
Answer:
x=30o+n90on∈Z
Step-by-step explanation:
cos2x=sin(90o−2x)=sin(2x−30o)
Which mean 90o−2x=2x−30o+n360o
or 90o−2x+2x−30o=(2n+1)180o
The later cannot be true.
so x=30o+n90on∈Z
Answer:
4th is correct answer. 1, 2, 3 not correct you can check the exponents properties
Answer:
choice C. Perfect square trinomial is correct.
Step-by-step explanation:
We need to find the pattern which is represented by the polynomial
.
To find that pattern, we need to factor ![4x^2+12x+9](https://tex.z-dn.net/?f=4x%5E2%2B12x%2B9)
![4x^2+12x+9](https://tex.z-dn.net/?f=4x%5E2%2B12x%2B9)
![=4x^2+6x+6x+9](https://tex.z-dn.net/?f=%3D4x%5E2%2B6x%2B6x%2B9)
![=2x(2x+3)+3(2x+3)](https://tex.z-dn.net/?f=%3D2x%282x%2B3%29%2B3%282x%2B3%29)
![=(2x+3)(2x+3)](https://tex.z-dn.net/?f=%3D%282x%2B3%29%282x%2B3%29)
![=(2x+3)^2](https://tex.z-dn.net/?f=%3D%282x%2B3%29%5E2)
which is a perfect square.
Hence choice C. Perfect square trinomial is correct.