Math questions Help!!! (1 Viewer)

od9895 · Jan 4, 2012

Simplify

1. sin^4a + sin^4acot^2a
2. cotBcosec^2B-cotB
3. cosec^3A-cosec^3Acos^2A

AAEldar · Jan 4, 2012

$\sin^4a+\sin^4a\cot^2a=\sin^4a(1+\cot^2a)$
$=\sin^4acosec^2a$

$cotBcosec^2B-\cotB=cotB(cosec^2B-1)$
$=cotB\cot^2B$
$=\cot^3B$

$cosec^3A-cosec^3A\cos^2A=cosec^3A(1-\cos^2A)$
$=cosec^3A\sin^2A$

deterministic · Jan 4, 2012

AAEldar said:
$\sin^4a+\sin^4a\cot^2a=\sin^4a(1+\cot^2a)$
$=\sin^4acosec^2a$

$cosec^3A-cosec^3A\cos^2A=cosec^3A(1-\cos^2A)$
$=cosec^3A\sin^2A$

These can be simplied further....

AAEldar · Jan 4, 2012

deterministic said:
These can be simplied further....

Yea I know, was getting them on the right track instead of giving them the whole answer - they should also recognise that they could be simplified.

springkse · Jan 4, 2012

nice. nostalgic

Math questions Help!!! (1 Viewer)

od9895

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AAEldar

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deterministic

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AAEldar

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springkse

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