Question

sin(-420°)=

cos(-750°)=

tg(-405°)=

2cos60°-tg π/4=

ctg45°-2sin π/6=

2cos30°·ctg60°-sin 3π/2=

ctg405°-ctg(-405°)÷2sin(-750°)=

Answer 1

1) минус корень из 3 на 2

2) корень из 3 на 2

3) минус один

 

Answer 2

sin(-420°)= -0.866025

cos(-750°)= 0.866025

tg(-405°)= -1

2cos60°-tg π/4= 0.986292

ctg45°-2sin π/6= 1.98172

2cos30°·ctg60°-sin 3π/2= 2.91784

ctg405°-ctg(-405°)÷2sin(-750°)= 0.75