If alpha is acute angle and 2sin^(2)alpha+15cos^(2)alpha=7, then cotal... 03:53 If 3xsintheta+2ycostheta=4and2xsintheta-3ycostheta=2, then relation be... 03:09 If sintheta+costheta=aandsectheta+cosectheta=b, then the value of b(a^... 02:11 If a sectheta+b tantheta=...