Question

if sin x=3/5 then the value of cos x is
a)4/5
b)4/5 but not -4/5
c)-4/5 but not 4/5
d) none of these
please give the accurate answer I will mark brainiest for the first answer​

Answer 1

Answer:

The answer is 4/5.....

Answer 2

Answer:

Option(a) $\frac{4}{5}$ is the required value of cosx .

Step-by-step explanation:

Explanation:

Given, sinx = $\frac{3}{5}$

As we know sin $\theta$ = $\frac{p}{h}$ and $cos \theta = \frac{b}{h}$

Where p stand for perpendicular , h stand for hypotenuse  and b stand for base.

Step 1:

By Pythagoras theorem

$h^2 = p^2 + b^2$

⇒ $b^2 = h^2 - p^2$

Now, put the value of p and h in the above formula,

⇒$b^2 = 5^2 - 3^2$

⇒$b= \sqrt{ 25 - 9} = \sqrt{16} = 4$

Therefore, cosx = $\frac{base}{hypotenuse} = \frac{4}{5}$ .

Final answer:

Hence, the value of cosx is $\frac{4}{5}$ .

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