Use Euler?s identity to (a)?show that (i) cos(? ? ?/2) = sin(?), (ii) ? sin(? ? ?/2)

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Use Euler?s identity to

(a)?show that

(i) cos(? ? ?/2) = sin(?),

(ii) ? sin(? ? ?/2) = cos(?),

(iii) cos(?) = sin(? + ?/2).

(b) to find

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