Root 3 /sin 20 - 1/cos 20
= (root3 cos 20 - sin 20 )/ (sin 20 cos 20)
(multiplying and dividing by 2)
= 2* (root3/2 cos 20 -1/2 sin 20)/ (sin 20 cos 20)
now sin 20 cos 20 = (2 sin 20 cos 20)/2 = (sin 40)/2
and writing root3/2 = sin 60, 1/2 = cos 60
= 2* (sin 60 cos 20 - cos 60 sin 20)/ (sin 40)/2
= 4* (sin (60-20))/sin 40
= 4* (sin 40)/sin 40
=4
Ask if any doubt in any step :)
Answer:
Step-by-step explanation:
<u>The second picture has:</u>
- 1 + 4 = 1² + 4
- 4 + 4 = 2² + 4
- 9 + 4 = 3² + 4
<u>The pattern is:</u>
Correct option is A
Answer:
Rational
Step-by-step explanation:
simplifies to 
.
Therefore, it is rational.
<em>Brainliest Appreciated. </em>
