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If A,B,C are the interior angle …

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If A,B,C are the interior angle of triangle ABC,then show that sin (B+C/2) =cosA/2. The above question can be proved by taking cos instead of sin

    • Posted by Krishna Prajapati 6 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Manash Pratim Das 6 years, 3 months ago

    We know A+B+C=180 => A+B+C/2 = 180/2 => A/2 + B+C/= 90 =>B+C/2 =90-A/2 =>Sin(B+C/2)= Sin(90-A/2) ( taking sin both the side) =>Sin(B+C/2)= cosA/2

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