Question

y tan 45°
=
values of x and y.
IfA=B=45°, then let us justify
(i) sin (A+B) = sin A cos B+cos Asin B
(ü) cos (A+B)=cos A cos B-sin Asin B​

Answer 1

Step-by-step explanation:

simply put the value of A and B as 45

Then,

I) sin90=sin45cos45+cos45sin45

1=1/2 + 1/2

1=2/2

1=1

Hence proved LHS=RHS

Similarly, you can prove the other one