[" Q."(cos^(2)33^(0)-cos^(2)57^(@))/(sin21^(0)-cos21^(@))=],[" 20"]

(cos^(2)33^(@)-cos^(2)57^(@))/(sin21^(@)-cos21^(@))=

The value of (cos^(2)33^(0)-cos^(2)57^(0))/(sin21^(0)-cos21^(0)) is

( cos^(2) 33^(@) - cos^(2) 57^@)/( sin 21^(@) - cos 21^(@))=

(cos^(3)21^(@)+cos^(3)39^(@))/(cos21^(@)+cos39^(@))=

(cos^(2)1^(0)-cos^(2)2^(0))/(2sin3^(0)*sin1^(0)) is equal to

Prove that: (cos^(2)33^(@)-cos^(2)57^(0))/((sin^(2)(21^(0)))/(2)-(sin^(2)(69^(0)))/(2))=-sqrt(2)

Without using trigonometric tables,evaluate each of the following: (sin^(2)20^(@)+sin^(2)70^(@))/(cos^(2)20^(0)+cos^(2)70^(@))+(sin(90^(@)-theta)sin theta)/(tan theta)+(cos(90^(@)-theta)cos theta)/(cot theta)+cos(40^(0)+theta)-sin(50^(@)-theta)+(cos^(2)40^(0)+cos^(2)50^(@))/(sin^(2)40^(0)+sin^(2)50^(@))

(sin21^(@)30')/(cos68^(@)30')

sin^2 33^@+cos^2 57^@=

The value of (cos24^(0))/(2tan33^(0)sin^(2)(57^(0)))+(sin162^(0))/(sin18^(0)-cos18^(0)tan9^(0))+cos162^(0) is equal to