The value of $sin (90^{o} - A) cos A + cos (90 - A) sin A$ is :

0

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Solution

The correct option is B $1$
$sin (90 ° - A) cos A + cos (90 ° - A) sin A$
$= cos A cos A + sin A sin A$
$\Rightarrow {cos}^{2} A + {sin}^{2} A = 1$
Hence, the answer is $1.$

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