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uysha [10]
3 years ago
6

Please please please help me out

Mathematics
2 answers:
Murrr4er [49]3 years ago
8 0

Answer:

what grade you in do you even do your work this easy is b

Anna [14]3 years ago
6 0

Answer:

a

Step-by-step explanation:

The order of operations is also referred to as PEMDAS

P for parenthesis

E for exponents

M for multiplication

D for division

A for addition

S for subtraction

The correct order of operations is a

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If cos x= 5/13 and sin x <0 find cos (x/2) and sin (2x)
taurus [48]
We know that

if cos x is positive
and
sin x is negative
so
the angle x belong to the IV quadrant

cos x=5/13
we know that
sin²x+cos²x=1-------> sin²x=1-cos²x------> 1-(5/13)²---> 144/169
sin x=√(144/169)-------> sin x=12/13
but remember that x is on the IV quadrant
so
sin x=-12/13

Part A) <span>cos (x/2)
cos (x/2)=(+/-)</span>√[(1+cos x)/2]
cos (x/2)=(+/-)√[(1+5/13)/2]
cos (x/2)=(+/-)√[(18/13)/2]
cos (x/2)=(+/-)√[36/13]
cos (x/2)=(+/-)6/√13-------> cos (x/2)=(+/-)6√13/13
the angle (x/2) belong to the II quadrant
so
cos (x/2)=-6√√13/13

the answer Part A) is 
cos (x/2)=-6√√13/13

Part B) sin (2x)
sin (2x)=2*sin x* cos x------> 2*[-12/13]*[5/13]----> -120/169

the answer Part B) is 
sin(2x)=-120/169
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3 years ago
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Step-by-step explanation:

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Step-by-step explanation:

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