`1+cos 56^0 + cos 58^0 - cos 66^0=4cos 28^0 cos 29^0 sin 33^0`.

If cos56^(0)+cos58^(0)-cos66^(0)-4cos28^(0)-cos29^(@)sin33^(@)=lambda then |2 lambda|=

If 1+cos56^(0)+cos58^(0)-cos66^(0)=k cos28^(0)cos29^(@)sin33^(@) then the value of k is

cos56^(@)+cos58^(@)-cos66^(@)-4cos28^(@)cos29^(@)sin33^(@)=

1+cos56^(@)+cos58^(@)-cos66^(@)=?

(1+cos56^(@)+cos58^(@)-cos66^(@))/(cos28^(@)cos29^(@)sin33^(@))=

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

Which of the following number (s) is/are rational ? a.sin 15^0 b. cos 15^0 c.sin 15^0cos 15^0 d. sin 15^0 cos 75^0

The expression (sin 22^0cos8^0+cos 158^0cos98^0)/(sin 23^0cos7^0+cos 157^0cos 97^0 ) when simplified reduces to- a.1 b. -1 c.2 d. none

cos1^(0)cos2^(0)...cos179^(@)