Evaluate -cos 48-sin 42-

Cos 48^∘ sin 42^∘ = cos (90^∘ 42^∘) sin 42^∘ = sin 42^∘ sin 42^∘= 0 (As, cos (90^∘ A) = sin A) ...

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Complementary Ratios

Evaluate :cos...

Question

Evaluate :
$c o s 48^{\circ} - s i n 42^{\circ} =$ ___

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Solution

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Evaluate :
$cos 48^{\circ} - sin 42^{\circ}$ ___

c o s 48^{\circ} - s i n 42^{\circ}

\frac{cos 55^{\circ}}{sin 35^{\circ}} - \frac{sin 42^{\circ}}{cos 48^{\circ}} =

(i) \frac{sin 18^{\circ}}{cos 72^{\circ}}

(i i) cos 48^{\circ} - sin 42^{\circ}

cos 48^{\circ} - sin 42^{\circ} = 0

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