In ABC- if a -16- b -24 and c -20- then cos B -2-MP PET 1988-A- 3 - 4B- 1 - 4C- 1 - 2D- 1 - 3

The correct option is A 3/42s = a + b + c : cos B/2 = √(30 × 6/320) = 3/4. ...

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Trigonometric Ratios of Half Angles

In ABC, if a ...

Question

In $△$ ABC, if a = 16, b = 24 and c = 20, then cos $\frac{B}{2}$ =
[MP PET 1988]

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[MP PET 1988]

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