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arctan of -1 equals x

How would you do it to find the exact answer

break tan up using cos and sin then evaluate

?

I answered you.

|dw:1352938933841:dw|

What is x though?

|dw:1352939039354:dw|

One more thing. How do you to arcsin and arccos without a calc?

arcsin of -1 is just asking what degree has a sin value of -1.

so arcsin of -1 is 3pi/2

Ohhh okay cool! Thank you

You're welcome.