## Elements of Trigonometry: Plane and SphericalCarl J. Martinson collection. |

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angle less angle of depression angle of elevation celestial circle circular measure colog common logarithm comp cos x cos² cosecant cosh cosine cosx cosy cotangent Cotg cotx curve decimal ecliptic equal equator figures Find the angle Find the distance Find the height find the logarithm find the remaining Find the value formulas FOUR-PLACE LOGARITHMS Given Hence hyperbolic functions hypotenuse included angle initial line integer L.Tang latitude light-house log cot log sin 28 LOGARITHMS OF NUMBERS loge longitude mantissa miles negative oblique triangle obtain perpendicular plane positive Prove pseudo-sphere radians right angle right triangle roots of unity secant sin b sin sin² sin³ sine and cosine sine and tangent sinh siny solution sphere spherical triangle ABC spherical trigonometry subtends an angle subtract TABLE tanc Tang tany terminal line tower TRIGONOMETRIC FUNCTIONS

### Popular passages

Page 21 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts.

Page 6 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor. , M , ,• , . logi — = log

Page 8 - To Divide One Number by Another, Subtract the logarithm of the divisor from the logarithm of the dividend, and obtain the antilogarithm of the difference.

Page 3 - The sine of an angle is equal to the sine of its supplement. The sine rule Consider fig.

Page 10 - Root of a Number: Divide the logarithm of the number by the index of the root ; the quotient is the logarithm of the required root of the number.

Page 11 - Hence, all numbers that differ only in the position of the decimal point have the same significant part. For example, .002103...

Page 6 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.

Page 6 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.