Question:
if cos x =-1/√2 how does x become -3π/4?
Answer:
Given cosx = -1/√2
cosx is negative in 2nd and 3rd quadrant.
Now in 2nd quadrant
cosx = -1/√2
=> cosx = cos(180-45)
=> x = Π -Π/4
=> x = 3Π/4
Not what you are looking for? Go ahead and submit the question, we will get back to you.
