Which of the following is an identity? a. secx tanx - cosx cotx = sinx b. (tanx + cotx)(sinx cosx) = 1 c. sin2x = 4 - 2cos2x d. cosx(2sinx + 1) = 0

Atriangle has side lengths of 15 inches and 30 inches. it also has angles that measure 45º and 20º. which of the following identifies the possible third angle of the triangle? a. 15 in., 65º b. 45 in., 65º c. 17 in., 115º d. 14 in., 115º

Which statements are true? see picture

Anyone know? will mark brainliest if you're correct!