can someone please help me with those questions?

Write the expression in terms of sine and cosine, and then simplify so that no quotients appear in the final expression. cos a - sec a . . . Choose the correct answer below. O A. - sin a tan a OB. cos za O C. cos 2 a - 1 OD. 1 O E. sin a OF. - cos 2 a cot 2 aVerify that the following equation is an identity. )2=1+sin4x (cos 2x + sin 2x Expand the expression on the left side, but do not apply any trigonometric identities. (cos 2x + sin 2x)2 = D Rearrange the terms and apply a Pythagorean identity. Type the new expression below. D Finally, show that this expression equals 1 + sin 4x by applying which of the following? Double-angle identity Cofunction identity Reciprocal identity .0993? Pythagorean identity Find an angle 9 that makes the statement true. cat (53 - 44) = tan (a + 20)