4 years ago

Math help What are 3 question about the equation do you need to ask before solving?

Mathematics

1 answer:

tatuchka [14]4 years ago

4 0

What strategies can i use to solve this equation

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Which sum or difference identity would you use to verify that cos (180° - q) = -cos q?

Phantasy [73]

Answer:

$\cos (a-b)=\cos a \cos b+\sin a \sin b$

Step-by-step explanation:

Given : $\cos (180^{\circ}-q)=-\cos q$

We have to write which identity we will use to prove the given statement.

Consider $\cos (180^{\circ}-q)=-\cos q$

Take left hand side of given expression $\cos (180^{\circ}-q)$

We know

$\cos (a-b)=\cos a \cos b+\sin a \sin b$

Comparing , we get, a= 180° and b = q

Substitute , we get,

$\cos (180^{\circ}-q)=\cos 180^{\circ} \cos (q)+\sin q \sin 180^{\circ}$

Also, we know $\sin 180^{\circ}=0$ and $\cos 180^{\circ}=-1$

Substitute, we get,

$\cos (180^{\circ}-q)=-1\cdot \cos (q)+\sin q \cdot 0$

Simplify , we get,

$\cos (180^{\circ}-q)=-\cos (q)$

Hence, use difference identity to prove the given result.

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allsm [11]

Answer:

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Step-by-step explanation:

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melamori03 [73]

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Work out, giving your answer in its simplest form: 5/ 14 x 7/ 30

Elena L [17]

X in (-oo:+oo)

((5/14)*x^7)/30 = 0

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x^7 = 0

x = 0

x = 0

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