Do anybody know this answer because i need

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).