Sin x cos x = -cos x
Find all angles that satisfy the equation below

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Ответ:

lilyclairehutson

03.12.2021

Mathematics

$x=90^\circ,270^\circ$

Step-by-step explanation:

sinxcosx=-cosx

sinxcosx+cosx=0

cosx(sinx+1)=0

cosx=0

x=90,270

sinx+1=0

sinx=-1

x=270

Therefore, the angles that satisfy the equation are $x=90^\circ,270^\circ$

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Ответ:

robert7248

01.12.2020

Mathematics

A. x = log 9

Step-by-step explanation:

10^x = 9

Log both sides:

log 10^x = log 9x log 10 = log 9x*1 = log 9x = log 9

Correct choice is A

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