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JuliettaMoon
@JuliettaMoon
August 2022
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Баллы даю за хотяб 3 решенных уравнения! Помогите, пожалуйста.
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miki68
Cosх/3=√2/2
х/3 = π/4
x= 3π/4
--------------------------
tg(x+π/3)=√3
x+π/3=π/3+πn
x=π/3-π/3+πn
x=πn
-----------------------------
2cos²х+5sinх+1=0
2-2sin²х+5sinх+1=0
-2sin²х+5sinх+3=0
sinх=t
-t²+5t+3=0
t²-5t-3=0
D=(-5)²-4*1*(-3)=25+12=37
t=(5+-√37)/2
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Answers & Comments
х/3 = π/4
x= 3π/4
--------------------------
tg(x+π/3)=√3
x+π/3=π/3+πn
x=π/3-π/3+πn
x=πn
-----------------------------
2cos²х+5sinх+1=0
2-2sin²х+5sinх+1=0
-2sin²х+5sinх+3=0
sinх=t
-t²+5t+3=0
t²-5t-3=0
D=(-5)²-4*1*(-3)=25+12=37
t=(5+-√37)/2