Question

QUESTION ⏫⏫⏫

SPAMMERS STAY AWAY !!!!​

Answer 1

Answer:

$\cos { }^{2} (2x) - \cos {}^{2} (6x) \\ = ( \cos(2x) + \cos(6x) )( \cos(2x) - \cos(6x) )\\ \\ use \: formulas \: of \: \cos(a) \pm \cos(b) \\ \\ = 2 \cos(4x) \cos(2x) ( 2 \sin(4x) \sin(2x) ) \\\\ = (2 \sin(2x) \cos(2x) )(2 \sin(4x) \cos(4x) ) \\\\ = \sin(4x) \sin(8x)$

Answer 2

hope it helps.

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# its unknown.