已知曲线积分(int )_(1)^1(1+dfrac ({cos )^2}({x)^2}cos dfrac (y)(x))dx+(sin dfrac (y)(x)+dfrac (by)(x)cos dfrac (y)(x))dy cosy/a)dx+(siny/s+bycxoyg当(int )_(1)^1(1+dfrac ({cos )^2}({x)^2}cos dfrac (y)(x))dx+(sin dfrac (y)(x)+dfrac (by)(x)cos dfrac (y)(x))dy cosy/a)dx+(siny/s+bycxoyg0" data-width="50" data-height="20" data-size="795" data-format="png" style="max-width:100%">时与路径无关，（1）求常数(int )_(1)^1(1+dfrac ({cos )^2}({x)^2}cos dfrac (y)(x))dx+(sin dfrac (y)(x)+dfrac (by)(x)cos dfrac (y)(x))dy cosy/a)dx+(siny/s+bycxoyg（2）求(int )_(1)^1(1+dfrac ({cos )^2}({x)^2}cos dfrac (y)(x))dx+(sin dfrac (y)(x)+dfrac (by)(x)cos dfrac (y)(x))dy cosy/a)dx+(siny/s+bycxoyg，使得(int )_(1)^1(1+dfrac ({cos )^2}({x)^2}cos dfrac (y)(x))dx+(sin dfrac (y)(x)+dfrac (by)(x)cos dfrac (y)(x))dy cosy/a)dx+(siny/s+bycxoyg