Write the Word or Phrase That Best Completes Each Statement$$( \sin x ) ( \tan x \cos x - \cot x \cos x ) = 1 - 2 \cos ^ { 2 } x$$

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The Answer of Write the Word or Phrase That Best Completes Each Statement$$( \sin x ) ( \tan x \cos x - \cot x \cos x ) = 1 - 2 \cos ^ { 2 } x$$

Write the Word or Phrase That Best Completes Each Statement $( \sin x ) ( \tan x \cos x - \cot x \cos x ) = 1 - 2 \cos ^ { 2 } x$