Question

1)Which of the following statement is true “only” for θ =30°, Justify your answer for each statement. *
Captionless Image
4cos^2θ -1=0
4cos^2θ -1=0
​

Answer 1

Answer:

1. 4cos^2θ -1=(2cosθ )^2-1
2. (2cos30°)^2-1=(✓3)^2-1=2

Answer 2

Step-by-step explanation:

4 4 cos squared theta minus one is equals to bracket inside 2 cos theta square

2 cos squared theta in bracket minus 1 is equal to under root 3 square minus 1 is equal to 2