Question

state the sign of trigonometry function 1)Sin(159°)

Answer 1

sin 159degree =0.358..

as sin159 is less than 180 hence it is +ve.

trignometry follos rules as per the graph

***(sin=s ; tan = t ; cos= c)

1st quadrant :: all are +ve ( s t c)

2nd quadrant:: s is +ve & t , c are -ve

3rd quadrant :: t is +ve & s, c are -ve

4th quadrant :: c is +ve & s,t are -ve

trick to remember :: All Silver Tea Cups

( all , sin , tan , cos)

( 1, 2, 3 , 4)

hope this helps....