Question

if 5 cosA=4 and A is acute angle then find tanA​

Answer 1

Answer:

cosA = 4/5 = adj/hyp

Accg to Pythagoras theorem

AC² = AB² + BC²

5² = 4² + BC²

25 = 16 + BC²

25 - 16 = BC²

BC² = 9

BC = √9

BC = 3cm

Tan A= opp/adj

Tan A= 3/4

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