Question
If X = 15°, find the value of: cos²(2X) +
sin²(3X) - tan²(2X)Solution
= cos²(30°) + sin²(45°) - tan²(30°)
= (√3/2)² + (1/√2)² - (1/√3)²
= 3/4 + 1/2 - 1/3 = 11/1
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