cos(−θ)=−√2/5 sin. θ>0
What is the value of sinθ?
−√23/5
√23/5
√2/5
−√2/5
(−θ) =cos^-1(-√2/5)
(θ) =106.43 Degrees
sin(106.43) =√23/5
Here's another way
sin = y / r
x = - √2
y = ???
r = 5
y = +√ [ r^2 - x^2 ]
y = + √ [ 5^2 - (-√2)^2 ]
y = + √ [25 - 2]
y = √23
So
sin = √23 / 5