1 Exercit˘ii rezolvate - Deliu - Cos2x sin2x 2cosx 4sinx

Trigonometrie plan a ˘si sferic a Ecuat˘ii trigonometrice 1 Exercit˘ii rezolvate 1.cos2x+4sinx−1 =0 R: ^Inlocuim ^ n ecuat˘ie cos2x=1−2sin2 x˘si obt˘inem 1−2sin2 x+4sinx−1 =0 ⇔ 2sinx(2−sinx) =0 Cum sinx≤1 ⇒ 2−sinx≥0 deci singura solut˘ie acceptabil a este sinx=0 de unde obt˘inem ................
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