Question

$\cos(15) + \cos(65) + \cos(175) = x$
find the velu of x
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Answer 1

Answer:

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Step-by-step explanation:

cos 15=0.9659

cos 65=0.4226

cos 175=(-0.9962)

Therefore: 0.9659+0.4226+(-0.9962)

= 0.3923