Test Academy | Which value is similar to sin-1sin(6 π/7)? sin-1(π/7), cos-1(π/7), sin-1(2π/7), coses-1(π/7)

Question

Which value is similar to sin-1sin(6 π/7)?

Options :

sin-1(π/7)
cos-1(π/7)
sin-1(2π/7)
coses-1(π/7)

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