Question

sin2A=2 sin A is true when A=​

Answer 1

Answer:

True for cos A = 1.

Step-by-step explanation:

The formula of sin 2A is,

$sin2A=2sinA cosA$

Solve the given expression as follows:

$sin2A=2sinA\\2sinAcosA=2sinA\\cosA=\frac{2sinA}{2sinA}\\=1$

So, sin 2A = 2sin A is true for cos A = 1.

Answer 2

Answer:

Step-by-step explanation: