Write the principal value of cos–1(cos 680°). – InterviewSolution

1.

Write the principal value of cos–1(cos 680°).

Answer»

Given cos^-1 (cos 680°)

= cos^-1 (cos (720° - 40°))

= cos^-1 (cos (2 × 360° - 40°))

= cos^-1(cos 40°)

= 40°

∴ cos^-1 (cos 680°) = 40°

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