Question

cos-1(cos 4pie/3) solution for this

Answer 1

hello friend....!!!

According to the given question we should find
${cos}^{ - 1} ( \frac{4\pi}{3} )$
we know that range of cos^-1 is [ 0 , π ]

so , since 4π / 3 does not belong to the range we should subtract 4π / 3 from 2π.

2π - 4π / 3 = 6π - 4π / 3 = 2π / 3 .

therefore,

${cos}^{ - 1} ( \frac{4\pi}{3} ) = \frac{2\pi}{3}$
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hope it helps...!!!