Question

sin2 B =2 sin B is true when B is equal to​

Answer 1

Answer:

sin 2B= 2 sin B is true when B is equal to 0°.

Answer 2

Answer:

The value of ∠B = 0°.

Step-by-step explanation:

We have:

$sin 2 B=2sin B$

To find, the value of ∠B = ?

$Hence,\:sin2B=2sinB\\\\2sinBcosB=2sinB$

Using trigonometric identity:

$sin\:2\theta=2\:sin\theta cos\theta\\\\cos\:B=2sin\:B/2sin\:B\\\\cos\:B=1\\\\cos\:B=cos0$

[cos 0°=1],

⇒ ∠B = 0°

Hence, the value of ∠B = 0°.

Hope it helps you//.

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