Question 1018132
Write the expression as the sine, cosine, or tangent of an angle.

cos 112° cos 45° + sin 112° sin 45°
<pre>The above is the "Difference of two angles" identity, as: {{{cos (A - B) = cos (A) cos (B) + sin (A) sin (B)}}}
Therefore, {{{cos (112 - 45) = cos (112^o) cos (45^o) + sin (112^o) sin (45^o)}}}
{{{cos (112 - 45)}}}, or {{{highlight(highlight_green(highlight(cos (67^o))))}}} = {{{cos (112^o) cos (45^o) + sin (112^o) sin (45^o)}}}