а) cos² 9П/8 - sin² 9П/8=cos9π/4=cosπ/4=√2/2
б) 6√ 3 * tg π/6 * sin π/6=3√3*tg π/6=3√3/√3=3
в) -4√ 3 * cos (-750°)= -4√ 3 * cos (-750°)= -4√ 3 * cos (-30°)=
-4√ 3 * cos 30°=-4√ 3 * √3/2=-6
г) 10√ 6 * cos( -π/4 )* sin( -π/3)= 10√ 6 *√2/2* ( -√3/2)=-10*6/4=-15
а) cos² 9П/8 - sin² 9П/8=cos9π/4=cosπ/4=√2/2
б) 6√ 3 * tg π/6 * sin π/6=3√3*tg π/6=3√3/√3=3
в) -4√ 3 * cos (-750°)= -4√ 3 * cos (-750°)= -4√ 3 * cos (-30°)=
-4√ 3 * cos 30°=-4√ 3 * √3/2=-6
г) 10√ 6 * cos( -π/4 )* sin( -π/3)= 10√ 6 *√2/2* ( -√3/2)=-10*6/4=-15