Question

50 points solve on copy.....

Answer 1

Answer:

2cos^-1(x^2)

Step-by-step explanation:

Let x=cos^2(a)

a=cos^-1(x^2)

cos^-1(2x-1) =cos^-1(2(cos^2(a))-1)

=cos^-1(cos(2a)) {=> 1+cos(2a)=2cos^2(a)}

=2a

=2cos^-1(x^2)

Hope this may help you and be the brainliest !

Answer 2

Answer in attachment...