Math, asked by yuvasree711, 4 months ago

Find the value of cos^-1(cosπ/7 cosπ/17 - sinπ/7 sinπ/17)

Answers

Answered by lahari60

1

Answer:

use this identity

COSACOSB-SINASINB=COS(A+B)

SO

Cos^-1(Cos(π/7+π/17)

Cos^-1(Cos(17π+7π/119)

24π/19

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