Question

solve 4th one........

Answer 1

Heyy here is your answer!!!!  Cos 9 A=SinA 9=SinA/CosA 9=tanA  Multiply by 5 9*5=5tanA 45°=5tanA  If it helps you then pls mark it as brainliest answer  

Answer 2

after that
10 alpha=90
alpha=9
tan5 alpha
tan 5*9
tan45°=1

Hope this will help you...!!