Question

Berapa hasil dari sin 75 derajat ,cos 75 derajat, tan 75 derajat beserta caranya ?

Answer 1

# sin (a - b) = (sin a x cos b) - (cos a x sin b)
sin 75 = sin (120 - 45)
= (sin 120 x cos 45) - (cos 120 x sin 45)
= ( x ) - ( x )
=  + 
= 0,965..

#cos (a - b) = (cos a x cos b) + (sin a x sin b)
cos 75 = cos (120 - 45)
= (cos 120 x cos 45) + (sin 120 x sin 45)
= ( x ) + ( x )
=  + 
= 0,258..

# tan x = sin x / cos x
tan 75 = sin 75 / cos 75
= 0,965 : 0,258
= 3,74..