Trig Identity Proving - need help
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Trig Identity Proving - need help

[From: ] [author: ] [Date: 11-07-05] [Hit: ]
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tan(x) * ( cos(x) + sin(x) ) + cot(x) * ( sin(x) + cos(x) )

( cos(x) + sin(x) ) * [ tan(x) + cot(x) ]

( cos(x) + sin(x) ) * [ sin(x)/cos(x) + cos(x)/sin(x) ]

( cos(x) + sin(x) ) * [ sin(x)*sin(x)/cos(x)*sin(x) + cos(x)*cos(x)/sin(x)*cos(x) ]

( cos(x) + sin(x) ) * [ sin^2(x)/cos(x)*sin(x) + cos^2(x)/sin(x)*cos(x) ]

( cos(x) + sin(x) ) * [ ( sin^2(x) + cos^2(x) ) / sin(x)*cos(x) ]

( cos(x) + sin(x) ) * [ (1/ sin(x)*cos(x) ]

[ ( cos(x) + sin(x) ) / sin(x)cos(x) ]

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3)

tan(x) * (1 - cot^2(x)) + cot(x) * (1 - tan^2(x))

tan(x) - cot^2(x) * tan(x) + cot(x) - tan^2(x) * cot(x)

sin(x)/cos(x) - ( cos^2(x)/sin^2(x) )*( sin(x)/cos(x) )+ cos(x)/sin(x)- (sin^2(x) / cos^2(x)) * cos(x)/sin(x)

sin(x)/cos(x) - ( cos(x)/sin(x) ) + cos(x)/sin(x) - (sin(x) / cos(x))

sin(x)/cos(x) - (sin(x) / cos(x))

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you welcome :)

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