" (ii) "(cos135^(@)-cos120^(@))/(cos135^(@)+cos120^(@))=(3-2sqrt(2))

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

cos120^o=

Prove that · (cos 135^@ - cos 120^@)/(cos 135^@ +cos 120^@) = 3-2sqrt2

Prove that: (cos 135^@ - cos120^@)/(cos 135^@ + cos120^@) =3-2 sqrt2 .

Find the value of (sin 135^(@) - cos 120^(@))/(sin 135^(@) + cos 120^(@))

cos510^(@)cos330^(@)+sin390^(@)cos120^(@)

cos1^(@)*cos2^(@)*cos3^(@)* * * cos 120^(@) =________.