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| 1. |
cot^2A+1/cot^2A= |
| Answer» cotA + 1/cotA = 1on Squaring both side(cotA +1/cotA)^2 =(1)^2cot^2A+ 1/cot^2A+2×cotA×1/cotA=1cot^2A+1/cot^2A= 2-1cot^2A+1/cot^2A =-1 | |