Question
If X = 15°, find the value of: sin²(3X) +
cos²(4X) - tan²(2X)Solution
= sin²(45°) + cos²(60°) - tan²(30°)
= (1/√2)² + (1/2)² - (1/√3)²
= 1/2 + 1/4 - 1/3 = 5/12
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