can someone explain this to me

Home - my.utrgv.edu | Home X Bb 7.3 Trigonometric Formulas - Hal X Course Hero X + - OX C a mycourses.utrgv.edu/webapps/blackboard/content/contentWrapper.jsp?content_id=_5994598_1&displayName=7.3+Trigonometric+Formulas+-+Half-Angle+and+Power-Reduc... u w. S UTRio Grande Valley Josee Hernandez 45 ? MyCourses Student Continuity Support Student Support MATH-2412-02-Spring2020 ... >Knewton Coursework > 7.3 Trigonometric Formulas - Half-Angle and Power-Reduction Formulas Use reduction formulas to simplify an expression Question With the aid of a power reducing formula, 32cosa = ? Select the correct answer below: 16 - 32cos (20) 16 - 16cos (20) 16 + 16cos (40) 16 + 16cos (2a) :FEEDBACK MORE INSTRUCTION SUBMIT Content attribution e o hulu O ON3 1 8 0 4 1 8:57 PM 3/17/2020