Найдите cos(a), если sin (a)=корень 7/4 и a€(п/2;п). Created by kkristina280900. algebra-ru

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Найдите cos(a), если sin (a)=корень 7/4 и a€(п/2;п)

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$\displaystyle sina=\frac{\sqrt{7}}{4}; a \in (\pi/2;\pi )\\\\cos^2a+sin^2a=1; cos^2a=1-sin^2a\\\\cos^2a=1-(\frac{\sqrt{7}}{4})^2=1-\frac{7}{16}=\frac{16-7}{16}= \frac{9}{16}\\\\cosa=|\frac{3}{4}|$

так как угол находится во II четверти то cosa<0

значит cos a= - ³/₄

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zadanie ne slozhnoe za obyom bally

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MORE):WOULD YOU LIKE SOME______ SOUP?...

1. I HAVE BREAKFAST AT SEVEN ________ MORNING 1.the 2.in 3.all 4.every 2. I USUA...

najdite sina esli cosa 311 i a005p

pomogite dejstvitelno te kto ponimaet anglijskij yazyk prostoe bushuyushie vremya

reshite pozhalujsta anglijskij3071693f552aa7652f6f24b5e1f85f92 93589

budu ochen blagodarna za reshenie246fa51d3f4b72963dfd542a7984bcce 26614

najdite v kazhdom ryadu sushestvitelnoe 1 a developing b development s devel

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