If 4cos^2a+4sina=5 show that sina=1/2
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4(cos^2a + sina)=5
cos^2a + sina=5/4
1 - sin^2a + sina = 5/4
-sin^2a + sina = 5/4 - 1
-sina (sina - 1 ) = 1/4
cos^2a + sina=5/4
1 - sin^2a + sina = 5/4
-sin^2a + sina = 5/4 - 1
-sina (sina - 1 ) = 1/4
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