Question

sin 3 a - 1 =0 find the value of a please I'm not getting this... ​

Answer 1

Answer:

30

Step-by-step explanation:

sin3A=1

sin3A=sin90

3A=90

A=30∘

Now, 

cos2A1−tan2A

= cos230˚1−tan230˚

= (23)21−(31)2

= 31−34 = 34−1 = 1

if you understood mark me brainliest...:)