<img src="https://tex.z-dn.net/?f=cos%5Cfrac%7Bx%7D%7B2%7D%20%3D" id="TexFormula1" title="cos\frac{x}{2} =" alt="cos\frac{x}{2}

pishuonlain [190]

3 years ago

=" align="absmiddle" class="latex-formula">± $\sqrt{\frac{1+cosx}{2} }$ , if A= $\frac{x}{2}$ then cosA=

Mathematics

1 answer:

11Alexandr11 [23.1K]3 years ago

3 0

Answer:

$\cos{A}=\pm\sqrt{\dfrac{1+\cos{x}}{2}}$

Step-by-step explanation:

$\cos{A}=\cos{\frac{x}{2}}=\pm\sqrt{\dfrac{1+\cos{x}}{2}}$

Apparently, you're supposed to recognize that the formula tells you the value of cos(x/2).

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