Question 724062

{{{(1+cos(20))(1+cos(60))(1+cos(100))(1+cos(140))}}}

= {{{(1+0.9396926)(1+0.5)(1-0.1736)(1-0.766)}}}

= {{{(1.9396926)(1.5)(0.8264)(0.234)}}}

= {{{(2.9095389)(0.193378)}}}

= {{{0.5626408134042}}}