Question

Find all solutions to the equation. (no calculator)
2cosx(sinx) - cosx = 0
Explanation on how to do it would be more helpful than just an answer

Answer 1

Perhaps factor it 1st: cosx(2sinx-1)=0

Answer 2

well remove the common factor and you ahve


cos(x)(2sin(x) -1) = 0

so,solve

cos(x)= 0

and

2sin(x) -1 = 0

hope it helps

Answer 3

then you can use exact values

Answer 4

Thanks! :)

Answer 5

since you cant use a calc, consider the unit circle