Question

$\bold{if \: sin \: \theta \: = \frac{4}{5} \: then \: find \: cos \: \theta}$

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Answer 1

Answer:

Given sin=4/5

As we know sin=Perpendicular/hypotanouse

Therefore sin=4(Perpendicular)/5(Hypotanouse

Now lets take a triangle ABC

Here lets find cos with respect to angle C .

Taking C as point of view we can say AB=4 and AC=5

We can find BC=3by using pythagorous formulae

As we know cos=Base/Hypotanause

Here Base is BC and Hypotanause is AC

Therefore cos=3/5 .

Answer 2

Answer:

we know that,

(Sinθ)^2 +(Cosθ)^2 =1

so,Cosθ = $\frac{3}{5}$

Step-by-step explanation: