Answer:
sin22°
Step-by-step explanation:
Using the cofunction identity
cos x = sin (90 - x), then
cos68° = sin(90 - 68)° = sin22°
The expression for cos 68° can write in sine using co function identity.
The expression for cos 68° using sine can written as sin 22° .
Given
The given expression is cos 68°.
Using co function identity write the expression.
[tex]\cos x= \sin(90-x)[/tex]
Substitute 68° for [tex]x[/tex].
[tex]\cos 68^{\circ}=\sin(90^{\circ}-68^{\circ})\\\cos 68^{\circ}=\sin 22^{\circ}[/tex]
Thus, the expression for cos 68° using sine can written as sin 22° .
Learn more about co function identity here:
https://brainly.com/question/2142743
