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how is (seca)(secb)(secc)=(tana+i)(tanb+i)(tanc+i) i=(-1)^1/2 how is (seca)(secb)(secc)=(tana+i)(tanb+i)(tanc+i)i=(-1)^1/2
it is true only if a+b+c=3pi/2 because , consider R.H.Sput Tana=sina/cosa, Tanb=sinb/cos, tanc=sinc/cosc=[sina+icosa][sinb+icosb]sinc+icosc]/cosa.cosb.cosc=cis(3pi/2-(a+b+c))[seca.secb.secc]if a+b+c=3pi/2 then =cis(0)[seca.secb.secc]=seca.secb.secc APPROVE IF USEFULL!!!!!
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