`(2cos 40^0-cos 20^0)/(sin 20^0)=`

(cos 10^0+sin 10^0)/(cos 10^0-sin 10^0) is equal to a. tan55^0 b. cos 55^0 c. -tan35^0 d. -cot35^0

The values of cos^2 73^0+cos^2 47^0-sin^2 43^0+sin^2 107^0 is equal to: (a) 1 (b) 1/2 (c) (sqrt(3))/2 (d) sin^2 73^@+cos^4 73^@

sin^(2)(cos^(-1)x)+cos^(2)(sin^(-1)(sqrt(1-x^(2)))) = ________ (0ltxlt1)

The exact value of (96sin80^0sin65^0sin35^0)/(sin20^0+sin 50^0+sin 110^0) is equal to

|{:(sin40^@,-cos40^@),(sin50^@,cos50^@):}|=.......

Prove that (4cos^2 9^0-3)(4cos^2 27^0-3)=tan9^0dot

Prove that, cos80^(@)+cos40^(@)-cos20^(@)=0

4\ cos\ 20^0\ -sqrt(3)\ cot\ 20^0\ =

Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0

int (dx)/(cos x sqrt(1+cos 2x+ sin 2x))= _______+C, (0 lt x lt (pi)/(4))