The sum of ages of a man and his wife is 81. The ratio of their ages is 5:4. Find the age of the younger person.

Mathematics

2 answers:

AfilCa [17]2 years ago

6 0

Answer:

i not 100% faithful but it B

Step-by-step explanation:

slamgirl [31]2 years ago

3 0

Answer:

A 30 years jjjajajajwiwkwkwiwqakaaiai

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Plzz solve this easy calculus :')

Digiron [165]

Answer:

$\sin \: x - \cos x \: + c$

Step-by-step explanation:

$\int \frac{cos2x}{ \sqrt{1 - sin2x} } dx \\ \\ = \int \frac{ {cos}^{2}x - {sin}^{2}x } { \sqrt{ {sin}^{2}x + {cos}^{2}x - 2sinx \: cosx } } dx \\ \\ = \int \frac{ ({cos}x - {sin}x )({cos}x + {sin}x )} { \sqrt{ {({cos}x - {sin}x )}^{2} } } dx \\ \\ = \int \frac{ ({cos}x - {sin}x )({cos}x + {sin}x )} {{ {({cos}x - {sin}x )} } } dx \\ \\ = \int({cos}x + {sin}x)dx \\ \\ = \int{cos}x \: dx + \int{sin}x \: dx \\ \\ = \sin \: x - \cos x \: + c$