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notka56 [123]
3 years ago
13

Let cos x =1√10 with x in QIV and find: cot2x

Mathematics
1 answer:
Mazyrski [523]3 years ago
3 0
Cos x = 1/√10
sin x = √( 1 - 1 /10 ) = √9/10 = - 3/√10 ( because x is in Q IV )
cot 2 x = cos 2 x/sin 2x = ( cos²x - sin²x)/ (2 sinx cosx ) =
= ( 1/10 - 3/10 )/(2 * (-3/√10)*1/√10)= (- 8/10 ) / (-6/10 ) = 8/6 = 4/3
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Mrs. Carlyle bought a bag of peanuts for her children. when Philip Joy Brent and Preston came home from school and they each too
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Answer:

Total peanut=324

Step-by-step explanation:

Let the peanut=x

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Remaining peanut=x-1/3x

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Remaining

324-108-54=162

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Preston=10

Total taken=Philip+joy+Brent+Preston

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Total remaining=Total peanut - total taken

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