1)1/ctg(a)+cos(a)/1+sin(a) 2)1/cos(a)-cos(a) Помогите пожалуйста решить. Created by Anora01. algebra-ru

cos(a)-cos(a) Помогите пожалуйста решить...

Anora01 @Anora01

August 2022 1 5 Report

1)1/ctg(a)+cos(a)/1+sin(a)
2)1/cos(a)-cos(a)
Помогите пожалуйста решить

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NeZeRAvix

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$1) \\ \dfrac{1}{ctg \alpha } + \dfrac{cos \alpha }{1+sin \alpha } = \\ \\ = \dfrac{sin \alpha }{cos \alpha } + \dfrac{cos \alpha }{1+sin \alpha }= \\ \\ = \dfrac{(1+sin \alpha )sin \alpha +cos^2 \alpha }{(1+sin \alpha )cos \alpha } = \\ \\ = \dfrac{sin \alpha +sin^2 \alpha +cos^2 \alpha }{(1+sin \alpha )cos \alpha } = \\ \\ = \dfrac{1+sin \alpha }{(1+sin \alpha )cos \alpha }= \\ \\ = \dfrac{1}{cos \alpha } \\ \\ 2) \\ \dfrac{1}{cos \alpha } -cos \alpha =$
$= \dfrac{1-cos^2 \alpha }{cos \alpha } = \\ \\ = \dfrac{sin^2 \alpha }{cos \alpha }$

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skolko metrov provoda secheniem 10mm2 nado vzyat chtoby soprotivlenie bylo ravn

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Anora01 September 2021 | 0 Ответы

1 ucheniku vydan rastvor hlorida magniya zapishite formulu veshestva s pomoshyu ko

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Verified answer

skolko metrov provoda secheniem 10mm2 nado vzyat chtoby soprotivlenie bylo ravn

1 ucheniku vydan rastvor hlorida magniya zapishite formulu veshestva s pomoshyu ko

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