Question

If sin theta = 3/4 then cos theta is equal to ​

Answer 1

4th is equal to the 3rd one

Answer 2

Step-by-step explanation:

sin theta = 3/4⇒ DC/BC

⇒BC=3k and AC=4k

where k is the constant of proportionality.

where k is the constant of proportionality.By Pythagoras theorem,

we haveAB²

=AC² −BC²

=(4k)²−(3k)²

=root 7k²

⇒AB= root 7k

So, cosA= AC/AB = root7k/4k

=7/4

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