Sin2x+cos2x=1
2sinxcosx+2cos^2x-1=1
2cosx(cosx+sinx-1)=0
2cosx=0 cosx+sinx=1
True
I did this with double angle formulas. sin2x=2sinxcosx, and cos2x=2cos^x-1. With plugging this in, I used factoring. At the end, there are two factors. One of the factors is cosx+sinx-1=0, which is cosx+sinx=1. Therefore, the answer is true.
Answer:
n= -5+ 7(n-1)
Step-by-step explanation:
1 full rotation is 2pi, or 360 degrees.
3.5 times either of those gives you 7pi, or 1260 degrees. Since you going counterclockwise already, you don't have to bother with negative signs.
7pi, or 1260 degrees.
The second option/letter b
Parallel lines has equal slopes.
Equation of the line 2x + y + 1 = 0 in slope intercept form is y = -2x - 1 with slope of -2. Therefore, the slope is -2.