Suggested: cosa/sinb sinc+cosb/sinc sina+cosc/sinasinb=2 - prove that sin(a+b)=sina.cosb+cosa.sinb - sin2a-sin2b/sinacosa-sinbcosb=tan(a+b) - sina/cosb.cosa+sinb/cosc.cosa+sinc/cosa.cosb=2 tana.tanb.tanc - cosa+cosb+cosc=1+4sina/2 sinb/2 sinc/2 - (cosa+cosb)^2+(sina+sinb)^2=4cos^2(a-b/2) - (cosa-cosb)^2+(sina-sinb)^2=4sin^2(a-b/2) - sina-sinb/cosa+cosb+cosa-cosb/sina+sinb=0 - sina+sinb=2 then cosa+cosb= - if a+b+c=π prove that cosa+cosb+cosc=1+4sina/2)sinb/2)sin(c/2) - sina+sinb/cosa+cosb - sina+sinb=a cosa+cosb=b - if sina/sinb=p and cosa/cosb=q - if 1/sina+1/cosa=1/sinb+1/cosb prove that cot(a/2+b/2)=tanatanb - cosa+sinb Browse related:
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