Question

If tan A=3/4
then cos A is _​

Answer 1

Answer:

tanA= P/B

P/B= 3/4

P=3

B=4

By PGT,

H=5

SO, COS A= B/H= 4/5

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Answer 2

Answer:

tan A=3/4

1 + tan²A = sec²A

1 + (3/4)² = sec²A

1 + 9/16 = sec²A

(16 + 9)/ 16 = sec²A

25/ 16 = sec²A

secA = 5/4

THEREFORE, Cos A = 4/5