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Monica [59]
3 years ago
15

If sec a = 5/4 and a is an angle in quadrant iv find the value of cos a

Mathematics
1 answer:
wariber [46]3 years ago
8 0
We know that
<span>sec a = 5/4
</span>sec(a)=1/cos(a)
then 
cos (a)=1/sec(a)
cos (a)=1/(5/4)=4/5---> is positive because the function cos is positive in IV quadrant

the answer is cos(a)=4/5
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When writing in scientific notation, we move the decimal point over until there is only a single digit to the right of the decimal point.

Currently the decimal point is all the way at the end of the 310 billion.

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We need to move it over to the left, keeping count of how many times we do so, and stopping when there is only one digit to the right of the decimal.

We end up with: 3.10000000000 or 3.1

We moved the decimal over 11 times. This can be represented by the value 10^11 (pronounced as "10 to the 11th power")

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Thus, we leave this as 3.1 x 10^11 which is scientific notation.

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