Cota+tana=secAcscAcosA+1/tan2 A=cosA/secA-1sin2asec2a+sin2acsc2a=sec2atan2a-1/se

Cota+tana=secAcscAcosA+1/tan2 A=cosA/secA-1sin2asec2a+sin2acsc2a=sec2atan2a-1/sec2a=tana-cota/tana+cotasin2a(1+cot2a)=1sin2a/cosa=seca-cosacosa/sinacota=1
Tan^2A+1/seca=secA
Cota+tana=secAcscA
cosA+1/tan2 A=cosA/secA-1
sin2asec2a+sin2acsc2a=sec2a
tan2a-1/sec2a=tana-cota/tana+cota
sin2a(1+cot2a)=1
sin2a/cosa=seca-cosa
cosa/sinacota=1
1/seca-tana=seca+tana
Sina/1-cosa-sinacosa/1+cosa=csca(1+cos2a)
Cot2a-1/1+cot2a=1-2sin2a
Cosa/1-sina=1+sina/cosa
1-sin2a/cosa=cosa
Cotasin2a=1+cos2a
Sin3a=3sina-4sin3a
Sin4a=4sinacosacos2a
Cos2a=1-tan2a/1+tan2a
Cos2a=2-sec2a/sec2a
Disprove 1+2cosa/sin2a=cota
Tana+cota=2csc2a
Sin(a+b)/cosacosb=tana+tanb
Tan(a+b)-tanb/1+tan(a+b)tanb=tana
Sin(a-b)sinb+cos(a-b)/coxb=sina/sinbcosb
Sin(x+h)-sinx/h=sinx(cosh-1/h)+cosx(sinh/h+
Sec2x=2/1+cos2x
Tanx=csc2x-cot2x
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