Prove the following- cos 3-4-x-cos 3-4-x-2 sin x

LHS= cos( 3π #160;/ 4 +x ) cos ( 3π #160;/ 4 x ) =cos( 3π #160;/ 4 #160;) cosx sin( 3π #160;/ 4 #160;) sinx [ cos( 3π #160;/ ...

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Substitution Method to Remove Indeterminate Form

Prove the fol...

Question

Prove the following:
$c o s (\frac{3 π}{4} + x) - c o s (\frac{3 π}{4} - x) = - \sqrt{2} s i n x$

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cos (\frac{3 π}{4} + x) - cos (\frac{3 π}{4} - x) = - \sqrt{2} sin x

Prove that

$(i) cos (\frac{π}{4} + x) + cos (\frac{π}{4} - x) = \sqrt{2} cos x$

(ii) $cos (\frac{3 π}{4} + x) - cos (\frac{3 π}{4} - x) = - \sqrt{2} sin x$

(cos (\frac{π}{4} + x) + cos (\frac{π}{4} - x) - \sqrt{2} cos x)

(cos (\frac{3 π}{4} + x) - cos (\frac{3 π}{4} - x) + \sqrt{2} sin x)

cos (\frac{3 π}{4} + x) - cos (\frac{3 π}{4} - x) = \sqrt{2} . sin x

cos (\frac{3 π}{4} + x) - cos (\frac{3 π}{4} - x) = - \sqrt{m} sin x

m

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