Question 1203100
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Rewrite cos(x-7pi/4) in terms of sin(x) and cos(x)
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<pre>
Use the formula of difference of arguments for the cosine function
in combination with table values of sine and cosine functions


    {{{cos(x-7pi/4)}}} = {{{cos(x)*cos(7pi/4)}}} + {{{sin(x)*sin(7pi/4)}}} = 

                 = {{{(sqrt(2)/2)*cos(x)}}} - {{{(sqrt(2)/2)*sin(x)}}}.    <U>ANSWER</U>
</pre>

Solved.