Then find the value of cosA and3If sin A=tanA.4

1.	Then find the value of cosA and3If sin A=tanA.4
Answer» Answer: GIVEN, sinA=43 ⇒DCBC=43 ⇒BC=3k and AC=4k where K is the CONSTANT of proportionality. By Pythagoras THEOREM, we have AB2=AC2−BC2=(4k)2−(3k)2=7k2 ⇒AB=7 k So, cosA=ACAB=4k7 k=47 And tanA=ABBC=7 k3k=7 3

Answer»

Answer:

GIVEN, sinA=43

⇒DCBC=43

⇒BC=3k and AC=4k

where K is the CONSTANT of proportionality.

By Pythagoras THEOREM, we have

AB2=AC2−BC2=(4k)2−(3k)2=7k2

⇒AB=7

So, cosA=ACAB=4k7

k=47

And tanA=ABBC=7

k3k=7

3

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Then find the value of cosA and3If sin A=tanA.4​

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Then find the value of cosA and3If sin A=tanA.4