I’ve posted answers already for these two!
Use the identities sec^2(x) = tan^2(x) + 1<span> and </span>cosec^2(x) = 1 + cot^2 (x)<span>, both are derived from the pythagorean identity of </span>1 = sin^2 (x) + cos^2 (x)<span> by dividing through by either sin</span>2<span> or cos</span>2<span> .</span>
<span>3. The measure of each interior angle of P is 90 degrees.</span>
-4/7 is a root of F, if we replace x by -4/7 in F, we will get 0
