`(sin^2 15^@- cos^2 15^@)/(sin^2 15^@ +cos^2 15^@)`

Find the value of (cos^2 30^@-sin^2 30^@)/(sin^2 15^@+cos^2 15^@) . (cos^2 30^@-sin^2 30^@)/(sin^2 15^@+cos^2 15^@) का मान ज्ञात कीजिए।

Which one of the following number (s) is/are rational? - 1) sin 15^(@) 2) cos 15^(@) 3) sin 15^(@) cos 15^(@) 4) sin15^(@) cos 75^(@)

2 sin 25^(@) cos 15^(@)=

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

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

What is the value of 2sin15^(@) cos 15^(@)-4sin^(3)15^(@)cos15^(@) ?

The value of (cos 15^(@) - sin 15^(@))/(cos 15^(@) + sin 15^(@) is

Which of the following number(s) is/are rational? (A) sin15^(@) (B) cos15^(@) (C) sin15^(@)cos15^(@)(D)sin15^(@)cos75^(@)

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