Asked by au
how to solve for the value of sine and cosine function of 0,90,180 and 270 degrees?
Answers
Answered by
Reiny
best way is to memorize and sketch the curves of both the sine and cosines curves, marking in those critical 4 values.
After 55 years of doing this, I still sketch them .
After 55 years of doing this, I still sketch them .
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