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प्रश्न
If A = 450, verify that :
(i) sin 2A = 2 sin A cos A
उत्तर
A= 450
`⇒ 2A = 2xx45^0=90^0`
(i) sin 2A = sin `90^0=1`
2 sin A cos A = 2 sin `45^0 cos 45 ^0 = 2 xx1/sqrt(2) xx 1/sqrt(2) = 1`
∴ sin 2A = 2 sin A cos A
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