Помогите пожалуйста! Срочно!!! найдите значение выражения √32 - √128 sin^2 7п/8. Created by anastaciarocha. algebra-ru

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anastaciarocha @anastaciarocha

July 2022 1 14 Report

Помогите пожалуйста! Срочно!!!
найдите значение выражения √32 - √128 sin^2 7п/8

Answers & Comments

Mihail001192

Verified answer

Применим формулу косинуса двойного аргумента:

cos2α = 1 - 2sin²α

√32 - √128•sin²(7π/8) = √32•( 1 - 2•sin²(7π/8) ) = √32•cos(7π/4) = √32•cos(2π - π/4) = √32•cos(π/4) = √32•√2/2 = √64/2 = 8/2 = 4

ОТВЕТ: 4

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Answers & Comments

Verified answer

Применим формулу косинуса двойного аргумента:

cos2α = 1 - 2sin²α

√32 - √128•sin²(7π/8) = √32•( 1 - 2•sin²(7π/8) ) = √32•cos(7π/4) = √32•cos(2π - π/4) = √32•cos(π/4) = √32•√2/2 = √64/2 = 8/2 = 4

ОТВЕТ: 4

cherez kakoj region ne prohodit bajkalo amurskaya magistral a amurskaya oblast

ne prohodite mimo geometriya ochen nuzhna vasha pomosh proshu pomoch teh kto zna

1uchebnik soderzhit 150 stranic na kazhdoj stranice 40 strok v kazhdoj stroke

opredelite pervuyu kosmicheskuyu skorost dlya sputnika solncadvizhushegosya na nebol

srochnoooo pomogite s obyasneniem pozhalujsta

kakoj iz perechislennyh administrativnyh centrov imeet zheleznodorozhnuyu svyaz s os

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5...

zadacha na foto reshite pozhalujsta77b61c1c37236107fa80e8e71f842961 40080

verno li utverzhdenie yomkost kondensatora zavisit ot napryazheniya na ego obkladk

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