Question

if sinA + cosA = 1 find value of sin2A? ​

Answer 1

Answer: 0

Step-by-step explanation:

As, sinA + cos A =1

So, A must be 0°

sin(0°)+ cos(0°)=1

0+1=1

Now,

sin2A= sin2(0°)

sin2(0)

=0

Hope this helps you

Answer 2

Answer:

Let's consider a triangle with angle b as 90 degree

Sin a=perpendicular/hypotenuse

Cos a =base/hypotenuse

Sin a+cos a=perpendicular/hypotenuse + base/hypotenuse

Sin a=1-cos a

Sin a=hypotenuse-base/hypotenuse

Sin 2a=2(hypotenuse-base)/hypotenuse