Question
What is the simplified value of the given
expression? 2(sin² 15° + sin² 75°) + 4sin 30° - (2sec 60° + cot 45°)Solution
2(sin ² 15° + sin ² 75°) + 4sin 30° - (2sec 60° + cot 45°)
Using, sin(90° - A) = cos A
= 2{sin ² 15° + sin ² (90 - 15)°} + 4 x 1/2 - {2 x 2 + 1}
= 2(sin ² 15° + cos ² 15°) + 2 – 5
Using, sin ² A + cos ² A = 1
= 2 x 1 + 2 - 5 = 2 + 2 - 5 = -1
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