Question

plz give this answer of trigometry by method

Answer 1

Answer:

Option (D)

Step-by-step explanation:

We have,

Beta + theta + 90 = 180 degree

(eb is a straight line)

So,

Beta + theta = 90 degree

Or,

90 - Beta = theta

Now,

Sin theta = sin (90 - beta)

Sin theta = cos beta

[by trig ratio of complementary angles, we have cosA = sin (90 - A) where A is some acute angle]

➡️ Cos beta = sin theta a

➡️ Cos beta = perpendicular /Hypotenuse

➡️ Cos beta = 4/5

Answer :

Option (D)