Prove That, $sec\left(\frac{\pi }{4} + \theta \right)\sec \left(\frac{\pi }{4} – \theta \right)$ = $2sec2\theta$
Prove That, $sec\left(\frac{\pi }{4} + \theta \right)\sec \left(\frac{\pi }{4} – \theta \right)$ = $2sec2\theta$ L.H.S: $sec\left(\frac{\pi }{4} + \theta \right)\sec …