If ` tan theta =(cos 12^@ + sin 12^(@))/(cos 12^(@)-sin12^(@)) " then " theta = `

If (cos 12^@ + sin 12^@)/(cos 12^@ -sin 12^@)=tan x^@ , what is the value of x.

If tan theta=5/12 then sin theta=

(cos 12^(@) - sin 12^(@))/(cos 12^(@) + sin 12) + (sin 147^(@))/(cos 147^(@))=

(cos12^@-sin12^@)/(cos12^@+sin12^@)+sin147^@/(cos147^@)=

(cos12^(@)-sin12^(@))/(cos12^(@)+sin12^(@))+(sin147^(@))/(cos147^(@))=

Cos^(-1)(cos12) -Sin^(-1) (sin12)=

IF tan theta =12/5 , then cos theta =

If tan theta=5/6 then (12 sin theta-5cos theta)/(12sin theta+5cos theta)=

If quad sin (theta + (7 pi) / (12)) + sin (theta- (pi) / (12)) + sin (theta + (3 pi) / (12)), Y = cos (theta + (7 pi) / (12)) + cos (theta- (pi) / (12)) + cos (theta + (3 pi) / (12)) then prove that (X) / (Y) - (Y) / (X) = 2tan2 theta