Leave a Comment / By anushka kumari / September 28, 2024 sec²θ(1 + sinθ)(1 − sinθ) = sec²θ(1 − sin²θ) = sec²θ × cos²θ = $ \displaystyle \left( {\dfrac{1}{{{{{\cos }}^{2}}\theta }}} \right)\times {{\cos }^{2}}\theta $ = 1