<span>we know that cos(a - b) = cos(a) cos(b) + sin(a) sin(b)
given a = π/3 and b = π/5
cos(π/3) cos(π/5) + sin(π/3) sin(π/5) = cos((π/3) - (π/5) = cos(2π/15)
hope it helps
</span>
<u>Solution</u><u>:</u>
- When, you rotate a picture by 180°, we rotate it by half of a full circle.
- The first picture is the original picture.
- The second picture is the image when it is rotated by 90°.
- The third picture is the images when, it is rotated once more by 90°. This image is the rotation of the image around P by 180°.
- So, the answer will be option A.
<u>Answer</u><u>:</u>
<u>Option </u><u>A.</u>
Hope you could understand.
If you have any query, feel free to ask.
4 * w =< 51
W its around 51/4 which is 12.75