- sin x = cos x
Divide both sides by - cos x
- sin x / - cos x = cos x / - cos x
tan x = - 1
Solution:
x = pi * n - pi / 4
If n = 1 then:
x = pi * n - pi / 4 = pi * 1 - pi / 4 = pi - pi / 4 = 4 pi / 4 - pi / 4 = 3 pi / 4
If n = 2 then:
x = pi * n - pi / 4 = pi * 2 - pi / 4 = 2 pi - pi / 4 = 8 pi / 4 - pi / 4 = 7 pi / 4
Can someone explain to me this :
-sinx=cosx
X=3pi/4 and 7pi/4
1 answer