Question

cos 45º + cos 135º + cos 225° + cos? 315°​

Answer 1

I didn’t get you brother

Answer 2

Answer:

We know that cos 45°=1/√2

cos135°=cos(90°+45°) =-sin 45°=-1/√2

cos225=(180°+45°)=-cos 45°=-1/√2

cos315°=cos(360°-45°)=cos 45°=1/√2

now, cos 45°=(1/√2) =1/2

cos135°=(1/√2) =1/2

cos225°=(1/√2) =1/2

cos315°=(1/√2) =1/2

now, 45°+135°+225°+315°=1/2+1/2+1/2+1/2= 2 is the answer