Prove that:
(1 + cosθ + sinθ )/(1 + cosθ - sinθ ) = (1 + sinθ )/cosθ
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L.H.S. = cos θ/(1 + sin θ) Multiplyiing num., and deno., by 1 – sin θ
= cos θ(1 – sin θ)/(1 + sin θ)(1 – sin θ)
= cos θ(1 – sin θ)/1 – sin2 θ
= cos θ(1 – sin θ)/cos2 θ
= 1 – sin θ/cos θ
= R.H.S.
Hence proved
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