सत्यापित कीजिए : ` 2 sin 30^(@) cos 30^(@) = sin 60^(@)` .

cos 60^(@) sin 30^(@) +cos 30^(@) sin 60^(@)=

sin 30^@ + cos 60^@ =………

co60^(@)sin30^(@)+cos30^(@)sin60^(@) =___.

sin60^(@).cos30^(@)+cos30^(@)*sin60^(@)

"(1) "sin60^(@)cos30^(@)+sin30^(@)cos60^(@)

sin 60 ^@ cos 30 ^@ + sin 30^ @ cos 60^@ = ?

sin30^@+cos60^@ = ……………..

Find x:sin 2x = sin 60^(@) cos 30^(@) - cos 60^(@) sin 30^(@) .

Prove that : (i) sin 60^(@) = 2 sin 30^(@) cos 30^(@) (ii) 4(sin^(4) 30^(@) + cos^(4) 60^(@)) - 3(cos^(2)45 - sin^(2)90^(@)) = 2