Question

what happens to the value of cos theta when theta increases from zero degree to 90 degree​

Answer 1

Answer:

As the angle increases from 0° to 90°, the sine increases from 0 to 1. As the angle increases from 0° to 90°, the cosine decreases from 1 to 0. Again you have an angle of 0° and a side with length 0. This time the vertical leg is 1, the same as the radius, so the sine is 1.

Answer 2

it decreases is cos 0 value is 1 and cos 90 value is zero so the angle goes on decreasing