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ХимБио2
@ХимБио2
August 2021
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[tex] \frac{cos ^{2}x}{4}- \frac{sin ^{2}x }{4} \geq 0 [/tex]
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xmark00
-> cos²x-sin²x>=0 -> 1-sin²x-sin²x>=0-> 1>=2sin²x -> sin²x<=1/2 -> |sinx|<=√2/2 -> -π/4<=x<=π/4
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