ATAN function

CALC FUNCTIONS

Mathematical Functions

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FUNCTIONS

Trigonometric

• COS
• SIN
• TAN
• COT
• ACOS
• ACOT
• ASIN
• ATAN
• ATAN2
• DEGREES
• RADIANS
• PI

Hyperbolic

• COSH
• SINH
• TANH
• COTH
• ACOSH
• ACOTH
• ASINH
• ATANH

Rounding and remainders

• TRUNC
• ROUND
• ROUNDDOWN
• ROUNDUP
• CEILING
• FLOOR
• EVEN
• ODD
• MROUND
• INT
• QUOTIENT
• MOD

Logarithm/Powers

• EXP
• POWER
• LOG
• LN
• LOG10

Bessel functions

• BESSELI
• BESSELJ
• BESSELK
• BESSELY

Miscellaneous

• ABS
• COMBIN
• COMBINA
• CONVERT
• CONVERT ADD
• COUNTBLANK
• COUNTIF
• DELTA
• ERF
• ERFC
• FACT
• FACTDOUBLE
• GCD
• GCD ADD
• GESTEP
• ISEVEN
• ISODD
• LCM
• LCM ADD
• MULTINOMIAL
• PRODUCT
• RAND
• RANDBETWEEN
• SERIESSUM
• SIGN
• SQRT
• SQRTPI
• SUBTOTAL
• SUM
• SUMIF
• SUMSQ

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ATAN

Returns the inverse tangent (the arc tangent) of a number.

Syntax:

ATAN(number)

returns the inverse trigonometric tangent of number, in other words the angle (in radians) whose tangent is number. The angle returned is between -PI/2 and PI/2.

To return the angle in degrees, use the DEGREES function.

Example:

ATAN(1)

returns 0.785398163397448 (PI/4 radians).

DEGREES(ATAN(1))

returns 45. The tangent of 45 degrees is 1.

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See Also

• COS
• SIN
• TAN
• COT

• ACOS
• ASIN
• ATAN2
• ACOT

• DEGREES

• Mathematical functions

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