Prove that:
\[
\cot ^{2} \theta-\cos ^{2} \theta=\cot ^{2} \theta \...
Prove that:
\[
\cot ^{2} \theta-\cos ^{2} \theta=\cot ^{2} \theta \cos ^{2} \theta
\]
\( \mathrm{P} \)
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