Question

Calculate the value of A ,if : i) (sin A-1) (2cos A-1)=0​

Answer 1

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$\bold{(sin \: A \: - \: 1 )\: ( \: 2 \: cos \: A \: - \: 1 \: ) \: = \: 0 \: }</p><p>$

$\bold{(sin \: A \: - \: 1 \: ) \: = \: 0 \: and \: 2 \: cos \: A \: - 1 \: = \: 0 \: }</p><p>$

$\bold{sin \: A \: - \: 1 \: and \: cos \: A \: = \: \frac{1}{2 \: } }</p><p>$

$\bold{sin \: A \: = \: sin90° \: and \: cos \: A \: = \: cos60° }</p><p>$

$\bold{A \: = \: 90° \: and \: A \: = \: 60°}</p><p>$

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