cos60^(@)cos30^(@)-sin60^(@)sin10^(@)

The value of cos60^(@)cos30^(@)-sin60^(@)sin30^(@) is equal is…………..

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

Evaluate each of the following : cos60^(@)cos30^(@)-sin60^(@)sin30^(@)

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^(@)

Evaluate : cos60^(@)cos30^(@)+ sin 60^(@)sin30^(@)

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

Verify each of the following : (i) sin60^(@)cos30^(@)-cos60^(@)sin30^(@)=sin30^(@) (ii) cos60^(@)cos30^(@)+sin60^(@)sin30^(@)=cos30^(@) (iii) 2sin 30^(@)cos30^(@)=sin60^(@) (iv) 2sin45^(@)cos45^(@)=sin90^(@)

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

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

Prove that : cos30^(@).cos60^(@)-sin30^(@).sin60^(@)=0