" 18."tan240^(@)+sin120^(@)=(3sqrt(3))/(2)

sin 240^@ + sin 120^@ =

sin120^(@)=sin(180^(@)-60^(@))=sin60^(@)=(sqrt(3))/(2) cos150^(@)=cos(180^(@)-30^(@))=-cos30^(@)=(-sqrt(3))/(2) tan172^(@)=tan(180^(@)-8^(@))=-tan8^(@)=-0.1405

4sin50^(@)-sqrt(3)tan50^(@)

sin120^(@)+tan150^(@)*cos135^(@)=(3+sqrt(2))/(2sqrt(3))

Prove that (i) " sin " 75^(@) =((sqrt(6)+sqrt(2)))/(4) (ii) (cos 135^(@) -cos 120^(@))/(cos 135^(@) +cos 120^(@)) =(3 -2sqrt(2)) (iii) " tan " 15^(@) +" cot " 15^(@) =4

sin240^@+sin120^@ = ……………

Evaluate the value of tan^(-1) (-sqrt(3)) +cos^(-1) (1/(sqrt(2))) + sin^(-1) (-(sqrt(3))/2)

Prove that: sin780^(@)s in120^(@)+cos240^(@)sin390^(@)=(1)/(2)

If cos18^(@)-sin18^(@)=sqrt(2)sinA . Then value of tan5A+cot5A+sin5A+cos5A is :