It's important because you need to find certain numbers for different causes and also it's important because the question that you're dealing with might also ask for only one variable
Answer:
<u>-2/7</u>
Step-by-step explanation:
2/5 x (-5/7)
multiply and reduce
-2 x 1/7
calculate
-2/7
Have a great day!!!
The equation 2cos^2(x) - 1 = 0 we manupulate by adding 1 to both sides and then dividing both sides by 2.
2cos^2(x) - 1 = 0
2cos^2(x) = 1
<span> cos^2(x) = 1/2
</span> cos(x) = ±√1/2
<span> cos(x) = ±√(2)/2 </span>
The answers to your question are <span>A. 3pi/4, B. 15pi/4, and D. </span>-7pi/4 as they all are angles with a reference angle of pi/4. They will have a cosine ratio of <span>√(2)/2 or </span><span><span>-</span>√(2)/2</span>
Yah same you can’t answer without a picture
Where are the following choices
