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malikxyo224
09.12.2019 •
Mathematics
Which of the following is a retirement plan sponsored by an employer that
allows employees to set aside money for retirement where the individual pays
taxes on money contributed, but not on the money withdrawn?
o a. roth 401(k)
o b. ira
o c. 401(k)
o d. roth ira
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Ответ:
It is given tan theta <0
we know that tan theta is negative ( OR <0 ) in second ( pi/2 to pi )and fourth quadrant ( from 3pi/2 to 2 pi ) only .
Given sin theta = 2/3 which is positive ( first and second quadrant ) value so we can consider second quadrant only
Second quadrant tan( theta ) is <0 and sin( theta ) >0
We know sin ^2 ( theta) + cos^2( theta) = 1
( 2/3) ^2 + cos^2( theta ) = 1
Cos^2 (theta ) = 1- ( 2/3)^2
Cos^2 ( theta ) = 1- (4/9)
Cos^2 (theta ) = ( 9-4) / 9
Cos^2 theta = 5 /9
Cos theta = sqrt 5/3 OR - sqrt 5 /3
BUT Cos is negative in second quadrant
So answer is - sqrt 5/ 3