Question

pls ans this guys pls​

Answer 1

 Best Answer

let's make theta=x (for ease of typing in) 

(sinx)/(1+cosx) 
multiply numerator & denominator with (1-cosx) 
=(sinx)*(1-cosx)/ (1+cosx)(1-cosx) 
=sinx(1-cosx)/ (1-cos^2x) 
=sinx(1-cosx)/ sin^2x {since cos^2x+sin^2x =1} 
=(1-cosx)/sinx 

Hence proved