Question

15sin76/ cos38*cos52

Answer 1

$frac{15sin76 ^{0} }{cos 38^{0}*cos 52^{0} } = frac{15sin 76^{0} }{cos 38^{0}*cos(90 ^{0}- 38^{0} ) } = frac{15sin(2*38 ^{0} )}{cos 38^{0} *sin38 ^{0} }= frac{15*2sin38 ^{0}*cos 38^{0} }{cos 38^{0}*sin 38^{0} }$
=30