3 years ago

. At 9 am on a regular school day, there are 35 students in the library. If for every 30 minutes,

Mathematics

1 answer:

katrin2010 [14]3 years ago

7 0

Answer:

360 minutes or In 6 hours.

Step-by-step explanation:

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AB Complementary<br><br> SinA = 4/5 find Cos b

Dmitry [639]

Answer:

$cos\:b = \frac{4}{5}$

Step-by-step explanation:

It is given that: a and b are complementary.

$\therefore a + b = 90\degree\\\\\therefore a = 90\degree - b\\\\Assuming\: sin \: ratio \: on\: both\: sides\\\\sin\:a = sin(90\degree - b)\\\\\therefore \frac{4}{5} = sin(90\degree - b)...(\because sin\:a = \frac{4}{5})\\\therefore \frac{4}{5} =cos\:b...\{\because sin(90\degree - \theta) = cos\: \theta\} \\\\\huge\purple{\boxed{\therefore cos\:b = \frac{4}{5}}}\\$