9. (cos 0° + cos 45º+sin 30)(sin 90° - cos 45º + cos 60°)
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Step-by-step explanation:
(cos 0° + cos 45° + sin 30°)(sin 90° - cos 45° + cos 60°)
=> (1 + 1/√2 + 1/2)(1 - 1/√2 + 1/2)
=> (1+1/2+1/√2)(1+1/2-1/√2)
=> (3/2 + 1/√2)(3/2 - 1/√2)
=> (3/2)² - (1/√2)²
=> 9/4 - 1/2
=> (9 - 2) / 4
=> 7/4
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