Evaluate: 4( sin²30⁰ - cos⁴60⁰) -9 (cos²45⁰ - sin²90⁰)
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Evaluate: 4( sin²30⁰ - cos⁴60⁰) -9 (cos²45⁰ - sin²90⁰)
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Answer:
10/2
Step-by-step explanation:
4( (1/2)² - (1/2)^4)-9((1/√2)²-1²)
4(1/4-1/8) - 9(1/2-1)
Taking the LCM,
4(2-1/8) -9(1-2/2)
4(1/8) -9(-1/2)
After multiplying,
1/2-(-9/2)
1/2+9/2
10/2
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