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Show that cos ^(4) alpha + 2 cos ^(2) al...

Show that `cos ^(4) alpha + 2 cos ^(2) alpha (1-(1)/(sec ^(2) alpha ))=(1- sin ^(4) alpha )`

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The correct Answer is:
`=1- sin ^(4) alpha =R.H.S`
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SRISIRI PUBLICATION-TRIGONOMETRIC RATIONS, TRANSFORMATIONS-LAQ
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