sin(x-120 độ)=cos 5x Mn giúp mình vs mai ktra rùi huhu :((

Question

sin(x-120 độ)=cos 5x
Mn giúp mình vs mai ktra rùi huhu :((

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Faith 2 tháng 2021-10-01T00:37:55+00:00 1 Answers 5 views 0

Answers ( )

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    2021-10-01T00:39:19+00:00

    Ta có

    $\sin(x – 120^{\circ}) = \sin(\pi/2 – 5x)$

    <->$ x – 2\pi/3 = \pi/2 – 5x + 2k\pi$ hoặc $x – 2\pi/3 = \pi – (\pi/2 – 5x) + 2k\pi$

    <->$ x = -\pi/36 + k\pi/3$ hoặc $x = -\pi/24 + k\pi/2$

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