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OpenStudy (jazzyfa30):
Use double-angle identity to find the exact value of each expression.
cos theta= (squareroot5/5)and 270 degrees
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OpenStudy (jazzyfa30):
@ganeshie8
ganeshie8 (ganeshie8):
draw the angle first, and draw the reference triangle
OpenStudy (jazzyfa30):
??????
ganeshie8 (ganeshie8):
|dw:1399381976870:dw|
ganeshie8 (ganeshie8):
since we're given that 270 degrees<theta<360, \(\theta \) lies somewhere in 4th quadrant as shown above^
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ganeshie8 (ganeshie8):
can u find the other missing side in the triangle ?
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