Posted by sonia on Tuesday, April 1, 2008 at 10:38am.
multiply the left side by (1-sinA+icosA)/(1-sinA+icosA)
expand and simply it down to
icosA/(1+sinA)
multiply that by (1-sinA)/(1-sinA)
expand again and simplify down to
i(1-sinA)/cosA
= i(1/cosA - sinA/cosA)
= i(secA - tanA)
= Right Side
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