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laska06464
@laska06464
July 2022
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1+cosx+cosx/2 помогите
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Lesben
1+cos x + cos x/2 = 1+ cos 2.x/2 + cos x/2=
=1+ cos ˇ2 x/2 - sinˇ2 x/2 + cos x/2 = 1-sinˇ2 x/2 + cosˇ2 x/2 + cos x/2 =
=cosˇ2 x/2 + cosˇ2 x/2 + cos x/2 = 2.cosˇ2 x/2 + cos x/2 =
=cos x/2 .(2.cos x/2 + 1)
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laska06464
ответ4 соsx/4cos(x/4+пи/6)сos(x/4-пи/6)
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Answers & Comments
=1+ cos ˇ2 x/2 - sinˇ2 x/2 + cos x/2 = 1-sinˇ2 x/2 + cosˇ2 x/2 + cos x/2 =
=cosˇ2 x/2 + cosˇ2 x/2 + cos x/2 = 2.cosˇ2 x/2 + cos x/2 =
=cos x/2 .(2.cos x/2 + 1)