- No entiendo como hacer este ejercicio. Ayuda ! (1-tanx) ^2 el resultado debe dar a sec^2 - 2tan x?

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The hydronium ion concentration in an aqueous solution at 25 C is 6.1 × 10-2 M. What is the hydroxide ion concentration in this solution? Find the mean of each pair of numbers. Graph the numbers & the mean on a number line. a. 5 and 15
b. -5 and 15
c. -5 and -15
d. 137 and 441? Is heat typically caused by some source of light? Your favorite prehistoric mammal? It's about moment generating problem. Help me to solve this problem please?