`tan^(2)120^(@)+cos^(2)150^(@)-sin^(2)300^(@)`

(5sin^(2)30^(@)+cos^(2)45^(@)-4tan^(2)30^(@))/(2sin30^(@).cos30^(@)+tan45^(@))=?

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)=

x tan^(2)120^(@)+4cos^(2)150^(@)=9rArr x=1)3213)24)4

(4(sin^(2)60^(@)+cos^(2)60^(@)))/(tan^(2)45^(@)-cos^(2)90^(@)+sin90^(@))

Prove that: tan720^(@)-cos270^(@)-s in150^(@)cos120^(@)=(1)/(4)

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^(@)

Find the value of sin^(2)(120^(@)-A)+sin^(2)A+sin^(2)(120^(@)+A):

(cos^(2)56^(@)+cos^(2)34^(@))/(sin^(@)56^(@)+sin^(2)34^(@))+3tan^(2)56^(@)tan^(2)34^(@)=?