Evaluate each expression exactly. Enter your answer in radians. () A) cos COS %3D 57 -1 B) cos COS %3D C) cos 1 COS 3 (co)() = D) cos CO

Q: 6. Use the sum and difference identities to simplify the expression. '5T COS 12

A:

Q: Find sec- (7.9) (in radians). (Hint: Use cos-1)

A: To find:sec-17.9

Q: what is the degrees of cos θ/2 = 1

A:

Q: Verify that the equation is an identity. cos B sin B sec B-tan B %3D sec B csc B

A:

Q: evaluate cos-1(cos(80 degrees))=

A: The objective of the question is to evaluate the expression cos^-1(cos(80 degrees)).

Q: cos - I resulted in a negative answer. Why is it impossible for cos to be 12 negative?

A: Let's find.

Q: 82 18 Riv 80

A: For a right triangle we know, cos(θ)=basehypotenuse