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h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 7 4 1 7 1 8 8 I don't follow your work Reiny ¡î3sinx + cosx = 1 ¡î3cosx = 1cosx square both sides 3cos^2 x = 1  2cosx + cos^2 x 3(1sin^2 x) = 1
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