Sin(a)=1/4 use trig identity sin^2(a)+cos^2(a)=1 to find cos(a)

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Ответ:

dakmil79

04.10.2021

Mathematics

Step-by-step explanation:

We can automatically eliminate D because since both matrices are 2x2, the product exists.

$\left[\begin{array}{ccc}1&5\\-3&4\end{array}\right] \left[\begin{array}{ccc}2&6\\6&-1\end{array}\right] =\left[\begin{array}{ccc}1*2+5*6&1*6+5*(-1)\\(-3)*2+4*6&(-3)*6+4*(-1)\end{array}\right]=\left[\begin{array}{ccc}32&1\\18&-22\end{array}\right]$

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