2cos2 x +7sin x - 5 = 0 Решите пожалуйста!!!. Created by estergloba. matematika-ru

2cos2 x +7sin x - 5 = 0 Решите пожалуйста!!!...

Simba2017 2cos2x+7sinx-5=0
2cos²x-2sin²x-7sinx-5=0
2-2sin²x-2sin²x+7sinx-5=0
-4sin²x+7sinx-3=0
sinx=t€[-1;1]
4t²-7t+3=0
D=49-48=1
t=(7±1)/8
t1=1;t2=3/4
sinx=1;x=π/2+2πk:k€Z
sinx=3/4;x=(-1)ⁿarcsin3/4+πn;n€Z

0 votes Thanks 0

армения20171

Verified answer

2(1-2sin^2x)+7sinx-5=0

sinx=t

-4t^2+7t-3=0

D=49-48=1

t1=(-7+1)/-8=3/4 sinx=3/5; x1= arcsin(3/4)+2pi; x2=pi-arcsin(3/4)+2pil

t2=(-7-1)/-8=1 sinx=1; x3=pi/2+2pik

2 votes Thanks 2

Answers & Comments

Verified answer

dana okruzhnost s centrom v tochke o av horda opredelit vid triugolnika voa

pomogite pozhalujsta dayu skolko est pomogite pozhalujsta prosh vas

pozhalujsta pomogite sdelat eti zadaniya dayu vse chto estproshuochen nado

9 x28x posle zvezdochki eto stepeni

pppppppppppooooooooooooommmmmmmmmmoooooooooooggggggggggggiiiiiiiiiiiittttttttttt

pppppppppppppooooooooooozhzhzhzhzhzhzhzhzhzhzhaaaaaaaaaallllllllllluuuuuuuuujjjjjjjjjjjssss

kak zdorove grazhdan vliyaet na obespechenie nacionalnoj bezopasnosti rossii

pozhalujsta pomogite reshit eto zadaniedayu 21 ball proshu ochen srochno nado

v ravnobokoj trapecii diagonal delit ostryj ugol popolam p tr 54 dmbolshee

2 a eto alfa p eto pi

рекомендуемые вопросы

Helpful Links

Helpful Social