Question
If X = 15Ā°, find the value of: sinĀ²(4X)
+ cosĀ²(3X) - tanĀ²(2X)Solution
= sinĀ²(60Ā°) + cosĀ²(45Ā°) - tanĀ²(30Ā°)
= (ā3/2)Ā² + (1/ā2)Ā² - (1/ā3)Ā²
= 3/4 + 1/2 - 1/3 = 11/12
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