<span>cos 2x + sqrt(2) sinx=1
</span><span>
Note that: cos 2x = cos^2x - sin^2x = (1-sin^2x) - sin^2x = 1 - 2sin^2x.
So, when alternatively written, you have the following equation:
</span>- 2sin^2x + sqrt(2)sinx + 1 = 1
- 2sin^2x + sqrt(2)sinx = 0
Then, let z=sin(x). So you get,
- 2z^2 + sqrt(2)z = 0
z(- 2z + sqrt(2)) = 0
Either z=0, or - 2z + sqrt(2) = 0 ---> z=sqrt(2)/2.
Then, since z=0 or z=sqrt(2)/2, therefore sin(x)=0, or sin(x)=sqrt(2)/2.
Then, for you remains just to list the angles. (Let me know if this is not fair or if you got questions.)
3.75 X 365 = X
or
3.75 X 366=x
or
3.75 X 180=x
I dont know what equation to use.
Answer:
22
Step-by-step explanation:
6x+3=7x-19
6x-7x=-19-3
-x=-22 |÷(-1)
x=22
Answer:
add it
Step-by-step explanation:
add 85 and 77 then minus it from 180
answer will come
