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# Math Formulas for Grade 10 ## List of Math Formulas for Grade 10

Here are some important math formulas for 10th-grade students:

### 1. Properties of Logarithms

The following properties of logarithms can be used to simplify expressions and solve equations involving logarithms:
log(ab) = log a + log b
log(a/b) = log a – log b
log ab = b log a

### 2. Trigonometric Identities

The following trigonometric identities are important for solving trigonometry problems:
sin2 x + cos2 x = 1
1 + tan2 x = sec2 x
1 + cot2 x = sec2 x

### 3. Sum and Difference Formulas

The sum and difference formulas can be used to find the sine, cosine, or tangent of the sum or difference of two angles:
sin(a ± b) = sin a cos b ± cos a sin b
cos(a ± b) = cos a cos b ∓ sin a sin b
tan(a ± b) = (tan a ± tan b)/(1 ∓ tan a tan b)

### 4. Binomial Theorem

The Binomial Theorem can be used to expand the power of a binomial expression:
(a + b)n = C(n, 0)an bo + C(n, 1)a(n-1) b1 + … + C(n, r)a(n-r) br + … + C(n, n)a0 bn

### 5. Permutations and Combinations

The formulas for permutations and combinations are important for counting problems:
Permutations: P(n, r) = n!/(n-r)!
Combinations: C(n, r) = n!/[(n-r)! r!]