Answer:
We have, \[co{{s}^{2}}67{}^\circ -si{{n}^{2}}23{}^\circ \] \[=co{{s}^{2}}67{}^\circ -co{{s}^{2}}\left( 90{}^\circ -23{}^\circ \right)\] [\[\because \]\[sin\left( 90{}^\circ -\theta \right)=cos\theta \]] \[=co{{s}^{2}}67{}^\circ -co{{s}^{2}}67{}^\circ \] \[=0\]
You need to login to perform this action.
You will be redirected in
3 sec