Question

if A,Band C are interior angles of a triangle ABC
then cos b+c/2 is equal to ​

Answer 1

Answer:

sin(a/2)

Step-by-step explanation:

cos{(b+c)/2}

cos{(180-a)/2}

cos{180/2 - a/2}

cos{90 - a/2} {cos(90-x) = sinx}

sin{a/2}

Answer 2

Answer:

78x-56

Step-by-step explanation:

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