3 years ago

Help me if someone can help

Mathematics

1 answer:

Novay_Z [31]3 years ago

8 0

Answer:

1.11111111 is rational

1.567 is a rational number.

Step-by-step explanation:

1.11111111 is rational

1.567 is a rational number.

1.101101110 is irrational

so its choice 1 and 2

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Answer:

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Step-by-step explanation:

We need to write sin (70) + sin(30) as a product. The formula used here is :

$\sin A+\sin B=2\sin (\dfrac{A+B}{2})\cos(\dfrac{a-b}{2})$

Here, A = 70 and B = 30

So,

$\sin 70+\sin 30=2\sin (\dfrac{70+30}{2})\cos(\dfrac{70-30}{2})\\\\\sin 70+\sin 30=2\sin 50\cos20$

So, the value of sin (70) + sin(30) is 2sin50 cos20. Hence, the correct option is (c).

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