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January 30, 2015

January 30, 2015

Posted by **sonia** on Tuesday, April 1, 2008 at 10:38am.

prove that

(1+sinA+icosA)/(1-sinA-icosA)=i(secA+tanA)

- algebra -
**Reiny**, Tuesday, April 1, 2008 at 1:50pmmultiply 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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