QUESTION

Asked by sonaisha | 24th Nov, 2008, 08:59: PM

Expert Answer:

NUMERATOR = cos A cosecA -sinA secA

=cosA/ sin A  - sinA / cos A

=(cos2A- sin2A ) / (cos A sinA ) = (cosA+sinA)(cosA-sinA) / (cos A sinA )

NUM / DEN = (cos A - sinA ) / (cos A sinA ) = cosecA - secA

Answered by  | 28th Nov, 2008, 02:30: PM

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