To avoid the confusion caused by the ambiguity of sin("x"), the reciprocals and inverses of trigonometric functions are often displayed as in this table. In representing the cosecant function, the longer form 'cosec' is sometimes used in place of 'csc'.

Different angular measures can be appropriate in different situations. This table shows some of the more common systems.
Radians is the default angular measure and is the one you use if you use the exponential definitions. All angular measures are unitless.

अनन्त गुणनफल का सूत्र
प्रयुक्त संकेतों (Notation) के बारे में
डिरिच्लेट् कर्नेल् (Dirichlet kernel)
अनेक किन्तु सीमित पदों के योग की स्पर्शज्या