sin38^(@)+sin22^(@)=sin82^(@)

Prove that: sin38^(@)+s in22^(0)=s in82^(0)

sin^(2)22^(@)+sin^(2)38^(@)+sin22^(@) sin38^(@)=

cos 38^(@) cos 8^(@) + sin 38^(@)sin 8^(@) is equal to

cos 38^(@) cos 8^(@) + sin 38^(@)sin 8^(@) is equal to ................ A) cos 30^(@) B) cos 60^(@) C) cos 45^(@) D) cos 38^(@)

(4sin9^(@)sin21^(@)sin39^(@)sin51^(@)sin69^(@)sin81^(@))/(sin54^(@))

(4sin9^(@)sin21^(@)sin39^(@)sin51^(@)sin69^(@)sin81^(@))/(sin54^(@))

(4sin9^(@)sin21^(@)sin39^(@)sin51^(@)sin69^(@)sin81^(@))/(sin54^(@))

sin10^(@)sin30^(@)sin50^(@)sin70^(@)sin90^(@)=

Simplify by reducing to a single term : sin 22 ^(@) cos 38^(@) + cos 22^(@) sin 38^(@).

The value of cos38^(@)cos52^(@)-sin38^(@)sin52^(@) is :