Compound Angle Identities (3 of 3: Proving cos & tan results)

[@S.compEng]

The three videos of compound angle identities realllllllly helped. Thank you soo much!!

[@yogasimmanravisagar]

Best Teacher ever

[@cristianvranic8433]

Amazing videos profesor! I loved them and i'm sure gonna use this knowledge in my own lectures.z

[@wengeance8962]

thanks dad

[@anantav51]

is the reason why you're dividing both the numerator and denominator of tan(α+β) by cos(α)cos(β) is to write it in terms of tan?

[@frankconrad79]

how and why did you use 90 degrees on cos(a+b)?

[@alkamishra9974]

There is a property sin(a+90)=cos(a) n vice versa he used it

[@michaelempeigne3519]

@@alkamishra9974 actually, it's sin ( 90 - x ) = cos x and cos ( 90 - x ) = sin x

[@SSJiBo]

IK360