Question 1115368
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What do you mean "solve"?<br>
There is no equation; there is nothing to solve.<br>
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"simplify" is not specific; the expression could possibly be simplified in different ways.  But for this example it seems clear what direction we are supposed to go.<br>
{{{4cos(x)^2+8cos(x)sin(x)+4sin(x)^2}}}
{{{4*(cos(x)^2+sin(x)^2)}}} + {{{4*(2sin(x)cos(x))}}}<br>
What is each of those expressions equal to...?