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@ziqbal103 You really need help on this? or did you already get your answer?

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Remember this

ok All Students Take Calaulus

sure @DanielK16

1) Sin<0 Cos>0

What quadrant has Cos positive but sin negative?

4 th quadrant

Correct! Now you just keep doing that and it's that easy!

next no.2 tell me @DanielK16 in which both are greater than zero ...

\(\large)thank~you~so~much\) @DanielK16

No problem :)