пожалуйста,решите тригонометрическое уравнение!! 5cos 2x

July 2022 1 6 Report

пожалуйста,решите тригонометрическое уравнение!!
5cos 2x - 14cos^2(в квадрате)x + 8 = 0

Answers & Comments

kalbim

Verified answer

$5*(2cos^{2}x-1)-14cos^{2}x+8=0$
$10cos^{2}x-5-14cos^{2}x+8=0$
$-4cos^{2}x+3=0$
$cos^{2}x= \frac{3}{4}$
1) $cosx=\frac{ \sqrt{3} }{2}$
$x=+- \frac{ \pi }{6} +2 \pi k$ , k∈Z
2) $cosx=-\frac{ \sqrt{3} }{2}$
$x=+- \frac{5 \pi }{6} +2 \pi k$ , k∈Z

2 votes Thanks 2

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pomogitepozhalujsta reshit trigonometricheskoe uravnenie sin 3x sin 7x 0

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reshite trigonometricheskoe uravneniepozhalujsta 3cos 2x 14cos x 7 0

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Answers & Comments

Verified answer

sostavte uravneniya reakcij v sootvetstvii so shemoj prevrashenij h2 gth2s gt

na sklyankah s prigotovlennymi rastvorami sulfata i sulfita natriya zabyli nakle

pomogite pozhalujsta 3 i 4c9caad21a7dcf6decc895813532c1c04 81315

reshite pozhalujstaobyasnivchto i kak delata to ya ne sovsem ponimayu na grafike

20^1,5...

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6)...

desyatyj chlen arifmeticheskoj progressii raven 29a summa pervyh odinnadcati chlen

pomogitepozhalujsta reshit trigonometricheskoe uravnenie sin 3x sin 7x 0

reshite trigonometricheskoe uravneniepozhalujsta 3cos 2x 14cos x 7 0

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