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| 1. |
If 8cotA=7,evaluate (1+sinA)(1-sinA)/(1+cosA)(1-cosA) |
| Answer» Given:\xa0=\xa0We have to find, the value of\xa0\xa0is:Solution:∴\xa0Using the algebraic identity:(a + b)(a - b) =\xa0Using the trigonometric identity:\xa0+\xa0\xa0= 1⇒\xa0\xa0= 1 -\xa0\xa0and\xa0\xa0= 1 -\xa0Using the trigonometric identity:\xa0=\xa0=\xa0Put\xa0\xa0=\xa0,\xa0we get=\xa0=\xa0∴\xa0\xa0=\xa0Thus, the value of\xa0\xa0is "equal to\xa0". | |