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

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

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

sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) sin 90^(@)=

Prove that sin38^@+sin22^@=sin82^@ .

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

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

(2sin38^(@))/(cos52^(@))

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^(@))