$sin 15^{o} + cos 105^{o} =$

0

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2 sin 15^{o}

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cos 15^{o} + sin 15^{o}

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sin 15^{o} - cos 15^{o}

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Solution

The correct option is A $0$
$cos (90 + θ) = - sin θ$
$sin 15^{o} + cos 105^{o} = sin 15^{o} + cos (90 + 15)^{o} = sin 15^{o} - sin 15^{o} = 0$
Option A

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