Sin²α + 4Cos²α = Sin²α + 4(1 - Sin²α) = Sin²α + 4 - 4Sin²α = - 3Sin²α + 4
Sin²α = 1/2 ⇒ - 3Sin²α + 4 = - 3 * 1/2 + 4 = - 1,5 + 4 = 2,5
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Sin²α + 4Cos²α = Sin²α + 4(1 - Sin²α) = Sin²α + 4 - 4Sin²α = - 3Sin²α + 4
Sin²α = 1/2 ⇒ - 3Sin²α + 4 = - 3 * 1/2 + 4 = - 1,5 + 4 = 2,5