" (i) "cos81^(@)-sin9^(@)=0

cos9^(@)-sin9^(@)=

cos 9^(@) - sin 9^(@)=

cos9^@-sin9^@=

(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=tan54^(@)

(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=?

(cos9^(@) + sin 9^(@))/(cos9^(@) - sin9^(@))=

Prove that (cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=cot36^(@)

If the value of cos9^(@)-sin9^(@)=sqrt(2)sin alpha where a in[0,3 pi], then the value of 'alpha' can be -