Physics, asked by Anonymous, 4 months ago

plz tell me answers fast​

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Answered by asdeepsingh777
3

Answer:

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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