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2. sin²γ+sinγ·cosγ·ctgγ=sin²γ+sinγ·cosγ·cosγ/sinγ=sin²γ+cos²γ=1;
3. (sinx-sin³x)/cos²x+2sinx=sinx(1-sin²x)/cos²x+2sinx=
=sinx·cos²x/cos²x +2sinx=sinx+2sinx=3sinx;
4. (5sinφ-3)/(4-5cosφ)-(4+5cosφ)/(3+5sinφ)=
=[(25sin²φ-9)-(16-25cos²φ)]/(4-5cosφ)(3+5sinφ)=
=(25sin²φ-25+25cos²φ)/(4-5cosφ)(3+5sinφ)=
=(25(sin²φ+cos²φ-1)/(4-5cosφ)(3+5sinφ)=0/(4-5cosφ)(3+5sinφ)=0
Х²+2(х-1)=6
х²+2х-2=6
х²+2х-8=0
д=4+32=36 (6)
х1= -2+6/2=2
х2= -2-6/2=-4
у1=2-1=1
2²+2•1=6
=(18x^3)^2-2*18x^3*56+56^2=324x^6-2016x^3+3136