Question #f18f0
1 Answer
Jan 26, 2018
Explanation:
#"using the "color(blue)"trigonometric identities"#
#•color(white)(x)secbeta=1/cosbeta#
#•color(white)(x)sin^2beta+cos^2beta=1#
#"divide all terms by "cos^2beta#
#(sin^2beta)/(cos^2beta)+(cos^2beta)/(cos^2beta)=1/(cos^2beta)#
#rArrtan^2beta+1=sec^2beta#