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Given cos(α)=58 and α is in quadrant I, find the exact value of cos(α/2).? Evaluate: -x^2 and for -(x)^2 for x = 7 (Please Show Work)? How many mL of a 0.50M solution Ca(OH)2 are necessary to neutralize 40mL of a 0.25 M HNO3 solution - Picture attached? What are the positives and negatives of cannibalism? Can I synthesize p2p using phenylacetic acid and acetic acid .without using thorium oxide catalyst.?