prove the derivative of sinx

11:25

19:12

11:20

32:03

18:37

10:52

1:38

5:16

5:16

8:03

4:56

10:04

3:08

کوتاه

6:36

6:36

5:27

5:27

4:54

4:54

4:58

4:58

3:02

4:20

4:20

3:02

18:42

18:42

5:03

7:08

2:49

2:52

1:27

کوتاه

6:25

2:00

1:51

6:01

1:35

43:39