Question
If X = 10°, find the value of: cos²(3X) +
sin²(6X) - tan²(3X)Solution
= cos²(30°) + sin²(60°) - tan²(30°)
= (√3/2)² + (√3/2)² - (1/√3)²
= 3/4 + 3/4 - 1/3 = 7/6
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