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OpenStudy (jazzyfa30):
costheta=4/5 and 270Degrees
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OpenStudy (jazzyfa30):
@ganeshie8
ganeshie8 (ganeshie8):
direct formula this time - no reference triangle business
ganeshie8 (ganeshie8):
use below : \(\cos 2 \theta = 2\cos^2 \theta - 1\)
OpenStudy (jazzyfa30):
cos2theta =2(4/5)^2-1
ganeshie8 (ganeshie8):
yup ! simplify
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OpenStudy (jazzyfa30):
7/25
ganeshie8 (ganeshie8):
\(\color{red}{\checkmark}\)
OpenStudy (jazzyfa30):
i need help with 5 more trig problems is that ok
ganeshie8 (ganeshie8):
yea sure
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