Question

cos²45+cos²135+cos²225+cos²310​

Answer 1

Answer:

1/2^2+(-1/2)^2+(-1/2)^2+(1/2)^2=1

Step-by-step explanation:

cos^2(45)=(1/2)^2=1=4 ,cos^2(135)=(-1/2)^2=1/4 ,cos^2(225)=(-1/2)^2=1/4, cos^2(310)=(1/2)^2=1/4 and the sume of all is 0ne

1/4+1/4+1/4+1/4=1 ans

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