Question

if a = 45 degree, verify that sin 2a = s sin a cos a


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Answer 1

Step-by-step explanation:

since a=45 therefore 2a=90

Sina=1/√2 =cosa , sin2a= 1

sin2a=2* sina*cosa

1= 2 * 1/√2 *1/√2

Thus, 1=1

hence verified!

Answer 2

sin2 a = sin a × cos a

a = 45°

sin 2.45° = sin 45° × cos 45°

sin 90° =1

sin 45° = 1/√2

cos 45° = 1/√2

1 = 2 × 1/√2 × 1/√2

1 = 1

hence proved