Y = 11
random text bla bla bla
Hopefully this helps you !
<span>cos<span>[<span><span>7pi/</span>4</span>]</span></span>=<span>cos<span>(2pi−pi<span>4</span>)
</span></span> =<span>cos<span>(−pi/<span>4</span>)
</span></span> =<span>cos<span>(pi<span>4</span>)
</span></span> =<span><span><span>√2/</span>2</span></span>
Answer:
B
Step-by-step explanation: