Question

if theta =45 degree.verify that cos 2 theta =cos square theta -sin square theta​

Answer 1

Answer:

0

Step-by-step explanation:

A = 45°

L.H.S

cos2A = cos2 (45°)

= cos90° = 0

R.H.S

cos^2A - sin^2A

= cos^2 45° - sin^2 45°

= (1/√2)^2 - (1/√2)^2

= 1/2 - 1/2 = 0

L.H.S = R.H.S , hence proved

Answer 2

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