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| 1. |
1/SECX-TANX=SECX+TANX |
| Answer» (1/SECX-TANX)(SECX+TANX) = SECX + TANX=> (SECX + TANX)/(SEC2X - TAN2X) = SECX + TANX=> SECX + TAN X = SECX + TAN X [SINCE SEC2X - TAN2X = 1] | |