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| 1. |
If cosA and cosB are acute angle such that cosA = cosB, then show that angle A = angle B. |
| Answer» Given,CosA=cosBTo prove-angleA=angleBproof-since,cosA=cosBso,b÷h=b÷h. (Cos thita=b÷h)Hence,angleA=angleB Proved. | |