ПОМОГИТЕ, ПОЖАЛУЙСТА)
[tex] \frac{2 cos^{2} 68^{0}-1}{2cos 113^{0}*sin 67^{0}} [/tex]
[tex] \frac{6 cos^{2} 34^{0}-3}{cos 169^{0}*cos79^{0}}[/tex]
[tex] \frac{2 cos^{2} 68^{0}-1}{2cos 113^{0}*sin 67^{0}} [/tex]
[tex] \frac{6 cos^{2} 34^{0}-3}{cos 169^{0}*cos79^{0}}[/tex]
Answers & Comments
=cos136/(-2cos67sin67)=-cos136/sin134=-cos(90+46)/sin(180-46)=sin46/sin46=1