Question

Cos60=1-sinsquare30=2cossquare-1=cossquare30-sinsqaure30

Answer 1

Answer:

I am still 9th class only

Sorry

Answer 2

Answer:

you have to put only the values of the trigonometric ratios

Step-by-step explanation:

cos 60=1/2

sin 30= 1/2

cos 30 =√3/2

sin 60=√3/2