Find the value of Sin^-1(cos(pi/9))

Dear Student,

We know that range of the principal value branch of sin-1 is -π2, π2.sin-1cosπ9 = sin-1sinπ2 - π9 = sin-1sin7π18 = 7π18 -π2, π2So, principal value of sin-1cosπ9 = 7π18

Regards

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