1/ SECA-TANA - 1/COSA
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1/(secA_tanA) _1/cosA
=>1/(1/cosA-sinA/cosA)-1/cosA
=>cosA/(1-sinA)-1/cosA
=>{cos^2A-1+sinA}/cosA(1-sinA)
=>{sinA-sin^2A}/(1-sinA)cosA
=>sinA/cosA=tanA
=>1/(1/cosA-sinA/cosA)-1/cosA
=>cosA/(1-sinA)-1/cosA
=>{cos^2A-1+sinA}/cosA(1-sinA)
=>{sinA-sin^2A}/(1-sinA)cosA
=>sinA/cosA=tanA
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