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3 years ago

Simplify:-(x +9) -3(4x - 3)

Mathematics

2 answers:

Serhud [2]3 years ago

7 0

Look at the attached picture⤴

Hope it will help u...

Dmitrij [34]3 years ago

3 0

Expand
-x-9-12x+9
Collect like terms
-13x

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(a) If tan A=x/y prove that: y.cos2A +x.sin2A= y. Please help me..

katrin2010 [14]

Answer: see proof below

Step-by-step explanation:

Use the following Double Angle Identities: cos 2A = 1 - 2sin²A

sin 2A = 2sinA · cosA

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Proof LHS = RHS

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x sin 2A = y(1 - cos 2A)

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This is a TRUE statement since it was given that $\tan A = \dfrac{x}{y}$

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3 years ago

[PICTURE ATTACHED] HHEELLPPP btw look at both of the pics

Natalija [7]

I think that it is the first line. I am not really sure what the question is asking so I may be wrong. Sorry if I can’t help

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