Sin39 cos6+sin6 sin51

Question

Sin39 cos6+sin6 sin51

Answer 1

sin39 cos6+sin6 sin51=sin(90-51)cos6+sin6sin51=cos51cos6+sin6sin51=cos(51-6)=cos45=sqrt(2)/2

Answer 2

1. 0.629320391049837*cos(6)+sin(6)*sin(51)

2. 0.629320391049837*0.994521895368273+sin(6)*sin(51)

3. 0.625872908100787+sin(6)*sin(51)
4. 0.625872908100787+0.104528463267653*sin(51)
5. 5. 0.625872908100787+0.104528463267653*0.777145961456971
6. 0.625872908100787+0.0812338730857599
7. 0.707106781186547

не знаю правильно или нет.