सिद्ध कीजिए की :
` sin 105^(@) sin 15^(@)=(1)/(4) `

sin 75^(@) + sin 15^(@) =

sin105^(@)+cos105^(@)=

sin 15^(@) + cos 105 ^(@) =

sin15^(@)+cos105^(@)=?

cos105^(@)+sin105^(@) = …………

Show that sin 105^(@) + cos 105^(@) =(1)/(sqrt(2))

Prove that (i) " 2 cos " 45^(@) " cos " 15^(@)=((sqrt(3)+1))/(2) " "(ii) 2 " sin " 75^(@) " sin " 15^(@)=(1)/(2) (iii) " cos " 15^(@) - " sin " 15 =(1)/(sqrt(2))

Show that sin 150^(@) + cos 105^(@) =(1)/(sqrt(5))