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Mathematics 25 Online
OpenStudy (anonymous):

another @ganeshie8

OpenStudy (anonymous):

What are the sine, cosine, and tangent of \[3\pi/4\] radians?

ganeshie8 (ganeshie8):

draw the unit circle

ganeshie8 (ganeshie8):

|dw:1393161495852:dw|

OpenStudy (anonymous):

|dw:1393161542007:dw|

OpenStudy (anonymous):

45/2

ganeshie8 (ganeshie8):

|dw:1393161553131:dw|

ganeshie8 (ganeshie8):

sin(3pi/4) = sin(pi - 3pi/4) = sin(pi/4) = \(\large \frac{\sqrt{2}}{2}\)

OpenStudy (anonymous):

pie /4 do we jsut simplify

ganeshie8 (ganeshie8):

yes^^

OpenStudy (anonymous):

is thaat the cos or sin

ganeshie8 (ganeshie8):

wat do u mean

OpenStudy (anonymous):

\[\sqrt{2}/\sqrt{2}\]

ganeshie8 (ganeshie8):

its a sin

ganeshie8 (ganeshie8):

and it should be \(\large \frac{\sqrt{2}}{2}\)

ganeshie8 (ganeshie8):

okay ?

ganeshie8 (ganeshie8):

cos(3pi/4) equals \(\large -\frac{\sqrt{2}}{2}\)

ganeshie8 (ganeshie8):

to find the tan, just take the ratio : sin/cos

OpenStudy (anonymous):

is it -1 @ganeshie8

ganeshie8 (ganeshie8):

\(\large \color{red}{\checkmark}\)

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