Sina cosa 1 sina cosa 1 cosa 1 sina
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Prove that 1 - cosA + sinA / sinA + cosA - 1 = 1 + sinA / cosA'
Answered by admin @
(1+sinA)(1-sinA)/cosA(1-sinA)
=sin2A/cosA(1-sinA)
=cos2A/cosA(1-sinA)
=cosA/(1-sinA)
=1/1/cosA-sinA/cosA
=1/secA-tanA
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