सिद्ध कीजिए : ` cos 75^(@) cos 15^(@) =(1)/(4) `

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

cos15^(@)-cos75^(@)=

Cos15^(@) - Cos75^(@) =

4sin75^@-3cos15^@=

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

The value of cos 75^(@) cos 15^(@) is equal to

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))

sin15^@cos75^@+cos^(2)15^@=

The value of cos 75^(@) cos 15^(@) is equal to .............. A) 1/2 B) (1)/(sqrt2) C) 1/4 D) 1