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Prove that : (i) sin42^(@)cos48^(@)+si...

Prove that : (i) `sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1`
(ii)`cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0`

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To prove the given statements, we will use trigonometric identities. ### (i) Prove that: \[ \sin 42^\circ \cos 48^\circ + \sin 48^\circ \cos 42^\circ = 1 \] **Step 1:** Recall the sine addition formula: \[ \sin(A + B) = \sin A \cos B + \cos A \sin B ...
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