2sin cos 2cos2 sin2 cos2 how to turn into a formula about tan Sorry forgotten 10

Summary. By shifting terms, 90 degrees plus 73 degrees plus 82 degrees equals 245 degrees and 245 degrees plus 180 degrees equals 425 degrees.

90°+73°+82°+(180° x)=360° full solution process.

By shifting terms, 90 degrees plus 73 degrees plus 82 degrees equals 245 degrees and 245 degrees plus 180 degrees equals 425 degrees.

425 degrees minus 65 degrees equals 360 degrees.

So x = 65 degrees.

Can you give me a columnar calculation.

What about people. OK.

Please solve this problem in this book, and I'll take a look.

The first one is solved, and the second one.

Which question still needs to be answered.

Summary. 50 [30 (40 50) (60 80)] How to do it in an easy way.

Divide and divide the math yet.

Don't use fractions to calculate, my family is an elementary school student who can't read fractions.

After taking it apart, put the same in a parenthesy.

Children just can't understand it.

It's the easiest.

I'm really sorry.

Oh, I see.

Didn't learn. Uh-huh.

The calculation process is as follows:

From the second term onwards, the difference between each term and its preceding term is equal to a constant in a series of numbers, often denoted by a and p. This constant is called the tolerance of the equal difference series, and the tolerance is often denoted by the letter d.

For example, ......2n-1。The general formula is:

an=a1+（n-1）*d。The first term a1 = 1, tolerance d = 2. The first n terms and the formula are:

sn=a1*n+[n*(n-1)*d] 2 or sn=[n*(a1+an)] 2. All of the above n are positive integers.

The equation doesn't hold, it's a miscalculation.

Left = 1 + 4d + 4d , right = 1 + 6d + 5d

If it's math, the equation doesn't hold.

Summary. How to solve 3x 4=4y 5:20z 6.

Can I give the question to the teacher?

33x×4=4y×5=20z×6

I made a mistake just now.

I confirm a question once.

There are no other conditions.

Just how to solve this equation.

The requirement is to find what to ask for, to find the value of xyz.

Here's the answer. The title next to me is too messy, you may not be able to read it clearly.

You see, you made a mistake again, obviously it's 3

The 33 you sent to the teacher

I want the teacher to do the math for you.

cos7=cos(15-8)=cos15cos8+sin15sin8 When you get here, you know that you are missing parentheses again, and you are harming others.

cos7°-sin15°sin8°)/cos8°=cos15cos8/cos8=cos15

Although I asked for this, I still feel that it is just a simplification of the question, and the value must be required, and the root number of the chain will come out.

cos15 = root number [(2cos15 2-1+1) 2] = root number [(cos30+1) 2] = root number [(root number 3+2) 4].

The approximate value cos15= can be obtained by looking up the table