Question

find tha value of cos^-1 (7pie/6)​

Answer 1

Answer:

Step-by-step explanation:

Here, we will use cos(π+x)=cos(π−x)

∴cos(7π6)=cos(π+π6)=cos(π−π6)

=cos(5π6)

∴cos−1(cos(7π6))=cos−1(cos(5π6))

=5π6, which is the required principal value as it is between 0 and π.

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Answer 2

Answer:

which is the required principal value as it is between 0