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marysya [2.9K]
3 years ago
9

Problem number 7 trigonometry

Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
8 0
7) - 1

tan <BAD = BD / AD

BC = √(64 + 36)
BC = √100
BC = 10

now you can solve BD
BD/6 = 6/10
BD = 6*6 / 10
BD = 36/10
BD = 3.6

AD = √36 - 12.96
AD =  √23.04
AD = 4.8

tan <BAD = BD / AD
tan <BAD = 3.6 / 4.8
tan <BAD = 0.75

7) - 2

cos <DAC + cos <DAB

as you know cos = Adj / Hypo

cos <DAC = AD/AC
cos <DAC = 4.8 / 8
cos <DAC = 0.6

cos <DAB = AD / AB
cos <DAB = 4.8/6
cos <DAB = 0.8

so
cos <DAC + cos <DAB = 0.6 + 0.8
cos <DAC + cos <DAB = 1.4

hope it helps


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Nataly_w [17]

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Step-by-step explanation:

 |    1    4    -1   |      |  2    -1   |

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                              | 5     2  |          It is possible to do this product,

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