Question

Please answer fast..
Correct answer with step by step procedure will be marked as brainliest
Sin(90-a).sin a + cos(90- a).cos a
-------------------- ------------------------
Tan a cot a

Answer 1

sin2a or 2sina.cosa

Step-by-step explanation:

sin(90-a).sina+cos(90-a).cosa/tana.cota

by formula

cos(a-b)=Cosa.Cosb+Sina.Sinb

cos(90-a-a)/tana.cota

sin2a/tana.cota

(sin2a)cosa.sina/sina.cosa

sin2a or 2sina.cosa