Question

a) 5 tan 540° + 2 cos 1170° +4sin 990° - 3 cos 540°

Answer 1

Answer:

Step-by-step explanation:

5tan(360+180)+2cos(3×360+90)+4sin(3×360-90)-3cos(360+180)

=-5tan180+2cos90-4sin90-3cos180

=-5tan(90+90)+2×0-4×1-3cos(90+90)

=5cot90+0-4+3sin90

=5×0+0-4+3×1

=0+0-4+3

=-1