Question

The resultant of two forces, each P, acting
at an angle thetta is :
[a] 2P sin thetta /2
[b] 2P cos thetta / 2
[c] 2P cos thetta
[d] P root2​

Answer 1

2P sin theta / 2 is the correct answer

$r {}^{2} = p {}^{2} + p {}^{2} + 2p {}^{2} \cos( \alpha ) \\r = 2p \sin( \alpha \div 2 )$

I hope it will be helpful