Question

what is the answer.
sin 20° =cos_____°.​

Answer 1

Step-by-step explanation:

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am assuming you mean 20 degrees. You could try it in two and a half ways:

a) Cubic equations:

I don’t know, but I know that:

sin(3x)=3sin(x)cos2(x)−sin3(x)=3sin(x)(1–sin2(x))−sin3(x)

And we know that sin(60)=3–√/2 . So if the answer is x , we get:

−4x3+3x−3–√/2=0

There are awesome formulas for these cubic equations (we don't even have a second-order term!) but I don’t know them. WolframAlpha has a bunch of i’s in their answer, getting three real numbers eventually, but the only solution that makes sense is about x≈0.34202 :

Answer 2

Answer:

sin 20° = cos 70°

Step-by-step explanation:

sin20°

= sin(90-70)

= cos = 70°

We know that,

By complementary angles property.

Sin (90°- A) = cos A

Therefore, sin 20°=cos 70°

That's your answer.

Hope this helps.

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