Question

plese tell the answer​

Answer 1

Answer:

Step-by-step explanation:

$\implies\sqrt{\dfrac{1-cosA}{1+cosA}}\\\\\implies\sqrt{{\dfrac{1-cosA}{1+cosA}}\times{\dfrac{1+cosA}{1+cosA}}}\\\\\implies\sqrt{{\dfrac{(1-cosA)(1+cosA)}{(1+cosA)^2}}}\\\\\implies\sqrt{\dfrac{(1-cos^2A)}{(1+cosA)^2}}\\\\\implies\sqrt{\dfrac{sin^2A}{(1+cosA)^2}}\\\\\implies \dfrac{sinA}{1+cosA}$  

                                   Proved