1) tg(-π/4) sin(-37π/6)
tg(-π/4) = -1
sin(-37π/6) = sin(-6π - π/6) = sin(-π/6) = -sin(π/6) = -1/2
Therefore, tg(-π/4) sin(-37π/6) = -1 * -1/2 = 1/2
2) Given: cos 90 degrees
cos 90 degrees = 0
Therefore, the value of cos 90 degrees is 0.
1) tg(-π/4) sin(-37π/6)
tg(-π/4) = -1
sin(-37π/6) = sin(-6π - π/6) = sin(-π/6) = -sin(π/6) = -1/2
Therefore, tg(-π/4) sin(-37π/6) = -1 * -1/2 = 1/2
2) Given: cos 90 degrees
cos 90 degrees = 0
Therefore, the value of cos 90 degrees is 0.