Show that `sqrt(3)"cosec" 20^(@)-sec20^(@)=4` .

(sqrt(3))/(sin20^(@)) - (1)/(cos20^(@)) =

The value of tan 40^(@) + tan 20^(@) + sqrt(3) tan 20^(@) tan 40^(@) is equal to

Find the range of f(x)="cosec"^(2)x+25sec^(2)x .

Show that tan 15^@ = 2 - sqrt3

Show that sec ^(2) theta+cosec^(2) theta geq 4

Show that tan^-1((-1)/sqrt3)+sec^-1(-2)-sin^-1(1/2)=pi/3

Show that sin^-1(3/5)-cos^-1(12/13)=cosec^-1(65/16)

Prove that 2 sec ^(2) theta-2 cosec^2theta-sec ^(4) theta+cosec^4 theta=cot ^(4) theta-tan ^(4) theta

The value of sec ^(2) ( tan ^(-1) 3) + cosec ^(2) (cot ^(-1) 2) is equal to

The value of cos 20^(@) + cos 100^(@) + cos 140^(@) is equal to a) (1)/(2) b) (1)/(sqrt(3)) c) sqrt(3) d)0