`sin 75 - sin15 = cos 15 + cos 105`

Prove that sin75^o -sin15^o =cos105^o +cos15^o

Prove that sin 75^(@) - sin 15^(@) = cos 105^(@) + cos 15^(@)

sin15^o +cos15^o is:

( sin 75^(@) - sin 15^(@))/( cos 15^(@) - cos 75^(@))=

(sin 75^(@) - sin 15 ^(@))/( cos 75^(@) + cos 15 ^(@)) = (1)/(sqrt3)

sin75^(@)-sin15^(@)=cos105^(@)+cos15^(@)

sin 15^(@) + cos 105 ^(@) = ............ A) 0 B) 2 sin 15 ^(@) C) cos 15^(@) + sin 15^(@) D) sin 15^(@) - cos 15^(@)

Which of the following number (s) is/are rational ? a.sin 15^0 b. cos 15^0 c.sin 15^0cos 15^0 d. sin 15^0 cos 75^0

What is the value of (5 sin 75^@ sin 77^@ + 2 cos 13^@ cos 15^@)/(cos 15^@ sin 77^@) - (7 sin 81^@)/(cos 9^@) ?