Question

calculate cos A and tan A.​

Answer 1

Step-by-step explanation:

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=7k

So, cosA=ACAB=4k7k=47

And tanA=ABBC=7k3k=

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