Crey | Find the value of tan-1⁡(13)+tan-1⁡(15)+tan-1⁡(\frac{1}{7})[/latex] tan⁻¹(4/7), tan⁻¹⁡(9/7), tan⁻¹(7/9), tan⁻¹1

Question

Find the value of tan-1⁡(13)+tan-1⁡(15)+tan-1⁡(\frac{1}{7})[/latex]

Options :

tan⁻¹(4/7)
tan⁻¹⁡(9/7)
tan⁻¹(7/9)
tan⁻¹1

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