Use the null factor law on each...
find, to 1 decimal place, all values of z in the interval -180 < z < 180 satisfying
- cos(z)(1+sin(z))= 0
- (1-tan(z))sin()z= 0
the problem here is i don't even know how to sort these out algebraically so i can then find the trig values. for example on the first question:
taking z(1+sin(z))= A
cosA= 0 for -90 and 90
so i have z(1+sin(z))=-90, 90
and i blank out on how to solve!