## Trigonometry Part 3(Solution): Advance math series 2000 most important questions.

Trigonometry Part 3(Solution): Advance math series 2000 most important questions.

**Solution 81.(d)**

** **

**Solution 82.(a)**

**Solution 83.(c)**

**Solution 84.(b)**

**Solution 85.(b) **cos 90°=0. Hence result=0

**Solution 86.(c)**

**Solution 87.(b)**

**Solution 88.(a)**

**Solution 89.(b)**

**Solution 90.(b)**

**Solution 91.(a)**

**Solution 92.(c)**

**Solution 93.(b)**

**Solution 94.(b)**

**Solution 95.(d)**

**Solution 96.(b) **Let the side of ABC are (a – d), a, (a + d) > 0 is A is smallest and angle corresponding to bigger side is C will be greater.

Hence ratio of three sides = 9a – d) : a : (a + d) = 4d : 5d : 6d = 4 : 5 : 6

**Solution 97.(b)**

**Solution 98.(c)**

**Solution 99.(d)**

**Solution 100.(a)**

**Solution 101.(a)**

**Solution 102.(a)**

**Solution 103.(c)**

**Solution 104.(b)**

**Solution 105.(b)**

**Solution 106.(a)**

**Solution 107.(a)**

→sin B . cos A = Cos B – sinA. cosB → sinA. Cos B + cos A. sin B = cos B →sin (A + B)

**Solution 108.(d)**

**Solution 109.(b)**

**Solution 110.(c)**

**Solution 111.(c)**

**Solution 112.(b)**

**Solution 113.(a)**

**Solution 114.(b)**

**Solution 115.(c)**

**Solution 116.(d)**

**Solution 117.(a)**

**Solution 118.(c)**

**Solution 119.(b)**

**Solution 120.(d)**