Question

Find the exact value of the expression, if it is defined.

cos(cos^-1 (6/7))

AND

Rewrite the expression as an algebraic expression.

sin (tan^-1(4x)-sin^-1(4x))

Answer 1

You break it up and work inside the bracket first. Find the inverse cosine of 6/7 or (1/cos) of 6/7. Then find the cos of that number. You would get better help if you place only one question per post.

Answer 2

Thanks!