Math, asked by sriharsha8903, 7 months ago

B
09. If a = 4, b= 5. c = 7 find cos
B/2

Answers

Answered by chinthalarana1234

1

Answer:

cos B/2=C2+a2-b2/2bc

=49+16-25/2(5)(7)

40/70

final ans is 4/7

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