You can
put this solution on YOUR website!Recall that
+\cos^2(\theta)=1)
So if
=0.8)
, then
=0.8^2=0.64)
. Plug this into the identity above to get:
+0.64=1)
Now solve for
)
:
=1-0.64=0.36)
=\sqrt{0.36}=0.6)
Now because
, this means that the value of sine will be negative.
So this means that
=-0.6)
Now recall the identity:
=2\sin(\theta)\cos(\theta))
... Start with the given identity
=2(-0.6)(0.8))
... Plug in
and
=-0.96)
... Multiply
So
which means that the answer is A) -0.96. So you are correct. Good job.
(