How to remember Trigonometric Identities and Formulas ?

Trigonometry - Tips & Tricks Free

  • Reciprocal Identities
  • Pythagorean Identities
  • Quotient Identities




  • Power Reducing/ Half Angle Formula
  • Sum to Product Formula




  • Co-function Identities
  • Parity Identities
  • Sum & Difference Formulas
  • Double Angle Formulas




  • Product to sum formula


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Is zero a rational number? Can you write it in the form p/q , where p and q are integers and q is not equal to 0?

Consider the definition of a rational number. A rational number is the one that can be written in the form of p/q, where p and q are integers and q is not equal to zero. 0 can be written as 0/1, 0/2, 0/3.... so on ) can be written as 0/(-1), 0/(-2), 0/(-3)... as well So, we arrive at the conclusion that 0 can be written in the form of p/q, where p and q are integers ( q can be positive or negative integers). Therefore, zero is a rational number.
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