" (i) "sin60^(@)cos30^(@)-cos60^(@)sin30^(@)=sin30^(@)

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

Evaluate : (i) sin60^(@)*cos30^(@)-cos60^(@)*sin30^(@) (ii) tan30^(@)*cosec60^(@)+tan60^(@)*sec30^(@) .

Show that (i) cos60^(@)*cos30^(@)-sin60^(@)*sin30^(@)=cos90^(@) (ii) cos60^(@)=1-2sin^(2)30^(@)=2cos^(2)30^(@)-1 (iii) (tan60^(@)-tan30^(@))/(1+tan60^(@)*tan30^(@))=tan30^(@)

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

Find the value of sin60^(@)cos30^(@)+cos60^(@)sin30^(@) .

Find the value of sin60^(@)cos30^(@)+cos60^(@)sin30^(@) .

Calculate : (tan60^(@)-tan30^(@))/(1+tan60^(@) tan30^(@))+cos60^(@) cos30^(@)+sin60^(@) sin 30^(@) .

If it right to say cos(60^(@)+30^(@))=cos60^(@)cos30^(@)-sin60^(@)sin30^(@)

Prove that : sin60^(@)cos30^(@)+cos60^(@).sin30^(@)=1