Buktikan bahwa: cos(a+b)+cos(a-b)=2 cos a cos b

Name: Buktikan bahwa: cos(a+b)+cos(a-b)=2 cos a cos b
Uploaded: 2024-03-17T15:31:43.000Z
Duration: PT1M15.066S
Description: Buktikan bahwa: cos(a+b)+cos(a-b)=2 cos a cos b