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To find the value of Ɵ Ɵ, calculate sin⁻¹ or cos⁻¹ or tan⁻¹ of the fraction on the right hand side. sin⁻¹ or cos⁻¹ or tan⁻¹ can usually be inputted on a scientific calculator ...
Dorothea D. Bone, SINE AND COSINE FUNCTIONS WITH A CALCULATOR, The Mathematics Teacher, Vol. 73, No. 7 (October 1980), pp. 521-524, 529 ...
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