cos theta =10/26 , theta lies in quadrant IV.. need answers for Sin 2theta, cos 2 theta, tan 2 theta

Question

anonymous · Answer

Look up arc cos (10/26) = theta
Then find the others from similar tables or calculator.

anonymous · Answer

i m trying but no luck !!

anonymous · Answer

What do you get for theta? 67.3 degrees ?

anonymous · Answer

Since it lies in the IV quadrant, it is 67.3 degrees below the horizontal or
360-67.3 = 292.7 degrees counter clockwise from theta = 0 (direction of x axis.).

anonymous · Answer

Your notation makes me unsure whether you are looking for the square of the sin or the sin of twice theta. Etc.

anonymous · Answer

idk for some reason my answers r totally wrong i guess ?