Prove that - tan2-tan2-sin - sin -cos2-cos2-

Simplify the LHS of tan #10;^2α #160; tan ^2β #160; = sin( α #160; + β)sin( α #160; β)/cos^2αcos #10;^2β #10; #10; tan ^2α #160; ...

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Trigonometric Equations

Prove that : ...

Question

Prove that :
${tan}^{2} α - {tan}^{2} β = \frac{sin (α + β) sin (α - β)}{{cos}^{2} α {cos}^{2} β}$

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