Answer:
5 x 320
Step-by-step explanation:
5 x 320 = 1600
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Starting from the Pythagorean identity, we deduce
![\sin^2(x)+\cos^2(x) = 1 \iff \cos^2(x) = 1-\sin^2(x) \iff \cos(x) = \pm\sqrt{1-\sin^2(x)}](https://tex.z-dn.net/?f=%5Csin%5E2%28x%29%2B%5Ccos%5E2%28x%29%20%3D%201%20%5Ciff%20%5Ccos%5E2%28x%29%20%3D%201-%5Csin%5E2%28x%29%20%5Ciff%20%5Ccos%28x%29%20%3D%20%5Cpm%5Csqrt%7B1-%5Csin%5E2%28x%29%7D)
If we plug in the value 7/10 for sin(x), we have
![\cos(x) = \pm\sqrt{1-\dfrac{49}{100}} = \pm\sqrt{\dfrac{51}{100}}=\pm\dfrac{\sqrt{51}}{10}](https://tex.z-dn.net/?f=%5Ccos%28x%29%20%3D%20%5Cpm%5Csqrt%7B1-%5Cdfrac%7B49%7D%7B100%7D%7D%20%3D%20%5Cpm%5Csqrt%7B%5Cdfrac%7B51%7D%7B100%7D%7D%3D%5Cpm%5Cdfrac%7B%5Csqrt%7B51%7D%7D%7B10%7D)
Answer:
because it is not a negitive number if you divide it and get a negitive number it still isnt -8
Step-by-step explanation:
Use PEMDAS. Parenthesis, Exponents, Multiply, Divide, Addition, Subtraction.
So, you'd distribute 5 into the parenthesis, leaving you with 9+20x+20, then add like terms. 20x+29