Question #ebba1

1 Answer
Nghi N.
Feb 17, 2017

Develop the Numerator of the left side:
NLS = sin u/(cos u) - cos u/(sin u) =
= (sin^2 u - cos^2 u)/(sin u.cos u)
Develop the Denominator of the left side:
DLS = sin u/(cos u) + cos u/(sin u) =
= (sin^2 u + cos^2 u)/(sin u.cos u)
(NLS)/(DLS) = (sin^2 u - cos^2 u)/(sin^2 u + cos^2 u) =
= sin^2 u - cos^2 u

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