sec-5pai/4=x then the value of x
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so sec 5π4= 1cos(5π4)
Now the angle is in 3rd quadrant and cosine is negative in the 3rd quadrant (CAST rule).
this means that the 1cos(5π4) = −1cos(π4)
and since cos(π4)=1√2 , your result is that
sec 5π4=−√21
Now the angle is in 3rd quadrant and cosine is negative in the 3rd quadrant (CAST rule).
this means that the 1cos(5π4) = −1cos(π4)
and since cos(π4)=1√2 , your result is that
sec 5π4=−√21
Amanisha76:
- root 2 h iska answr
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