Question

1) 2× sin 45 - cos 60+3×ctg 60+sin30
2)sin 60 ×cos 45-2×sin 45 ×cos60+sin 45
3) tg60-sin 60 -sin 30
-------------------------------
Sin 60-cos30×tg 30

Answer 1

1.
2×rad2/2 - 1/2 + 3×rad3/3 + 1/2 =
rad2 - 1/2 + rad3 + 1/2 =
rad2 + rad3

2.
rad3/2 × rad2/2 - 2×rad2/2 × 1/2 + rad2/2 =
rad6/4 - rad2/2 + rad2/2 =
rad6/4

3.
rad3 - rad3/2 - 1/2 =
(2rad3 - rad3 - 1)/2 =
(rad3 - 1)/2

4.
rad3/2 - rad3/2 × rad3/3 =
rad3/2 - 3/6 =
rad3/2 - 1/2 =
(rad3 - 1)/2