(1-2[cos60^(@)-cos80^(@)])/(2sin10^(@))=

If the value of expression (2cos10^(@)-cos50^(@))/(sin70^(@)-cos80^(@)) is m then (3m^(2)-4) is equal to

Value of the expression : (1+2sin60^(@)cos60^(@))/(sin60^(@)+cos60^(@))+(1-2sin60^(@)cos60^(@))/(sin60^(@)-cos60^(@)) is

Show that : (i) (1-sin60^(@))/(cos60^(@))=(tan60^(@)-1)/(tan60^(@)+1) (ii) (cos30^(@)+sin60^(@))/(1+sin30^(@)+cos60^(@))=cos30^(@)

((1)/(cos80^(@)))-(sqrt(3))/(sin80^(@))=

Evaluate |(sin 10^(@) -cos 10^(@)),(sin 80^(@) cos 80^(@))|

What is the value of |(sin 10^(@)-cos 10^(@)),(sin 80^(@),cos 80^(@))| ?

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^(@)

((cos30^(@)+sin60^(@))/(1+cos60^(@)+sin30^(@)))=(sqrt(3))/(2)

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

cos20^(@)cos40^(@)cos60^(@)cos80^(@)=