# Trig

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Prove cos^2t+4cost+4/cost+2=2sect+1/sect

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(cos^2t+4cos^2+4)/(cost+2)=(2sect+1)/sect
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Prove cos^2t+4cost+4/cost+2=2sect+1/sect
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Prove cos^2t+4cost+4/cost+2=2sect+1/sect
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if cos(B-C)+cos(C-A)+cos(A-B)=-3/2 then prove that cosA+cosB+cosC=O and sinA+sinB+sinC=O after that prove that cos(B-C)=cos(C-A)=cos(A-B)=-1/2

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