Question

plz solve this urgent​

Answer 1

Answer:

as explained below

Step-by-step explanation:

1) Sin90=1

sin45=$\frac{1}{\sqrt{2} }$  cos45=$\frac{1}{\sqrt{2} }$

2 sin45.cos45=2*(1/2)=1

LHS= SIn90=1

RHS=2Sin45.Cos45=1

2) Cos 2A=