Buktikan: cos(a+b) cos(a-b)=cos^2 a-sin^2 b

Name: Buktikan: cos(a+b) cos(a-b)=cos^2 a-sin^2 b
Uploaded: 2024-06-16T18:59:08.000Z
Duration: PT1M54.3583S
Description: Buktikan: cos(a+b) cos(a-b)=cos^2 a-sin^2 b