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यदि B=30^(@) तो सिद्ध करें कि((1-cosB)(1...

यदि B=30^(@) तो सिद्ध करें कि((1-cosB)(1+cosB))/((1-sinB)(1+sinB))=(1)/(3) | 10 | त्रिकोणमितीय ...

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