Question

1.sin10+cos20

2.sin20+cos10

3.cos20-sin10

4.cos10-sin20

 

Answer 1

1. =0.135

2. =0.073

3. =0.952

4. =1.752

Answer 2

1.sin10+cos20=cos(пи/9)+sin(пи/18)

2.sin20+cos10=sin(пи/9)+cos(пи/18)

3.cos20-sin10=cos(пи/9)-sin(пи/18)

4.cos10-sin20=cos(пи/18)-sin(пи/9)