Question 1201685
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Answer: <font color=red size=4>4</font>


Work Shown:


{{{4cos^2(theta) + 4sin^2(theta)}}}


{{{4(cos^2(theta) + sin^2(theta))}}}


{{{4(1)}}} use pythagorean trig identity


{{{4}}}


Therefore,
{{{4cos^2(theta) + 4sin^2(theta)=4}}}
is a trig identity.
It is true for all real numbers.
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