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L.H.S: Cos(3pi/4 + x) -cos(3pi/4 - x)
: [cos(3pi/4)cos x - sin(3pi/4)sin x] - [cos(3pi/4)cos x + sin(3pi/4)sin x]
: -2[sin( pi - pi/4) sin x
: -2[1 /root (2) × sin x]
: - [root(2) × root(2) × sin x] / root(2)
: -root(2) sin x
= R.H.S
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