(Sac A+ tanA-1 )(sacA-tanA+1) equal 2tan A
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(SecA +tanA-1) (SecA-tanA+1)
(secA-1+tanA) ( 1/cosA- sinA/cosA+1)
1-sinA+cosA
(tanA +tanA) (______ )
cosA
1-sinA =cosA
(2tanA) cosA+cosA
( ________ )
cosA
(2tanA) cosA +cosA
cosA cosA
=2tanA
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