+65-85483705

Trigonometric Identities

Reciprocal Identities

  • sin x = 1/cosec x
  • cos x = 1/sec x
  • tan x = 1/cot x

Pythagorean Identities

  • sin2x + cos2x = 1
  • 1+tan2x = sec2x
  • 1+cot2x = cosec2x

Quotient Identities

  • tanx = sinx/cosx
  • cotx = cosx/sinx

Double Angle Formulas

  • sin2x = 2sinxcosx
  • cos2x = cos2x – sin2x / 2cos2x – 1 / 1-2sin2x

Sum and Difference formulas

  • sin(x+y) = sin x(cos y) + cos x(sin y)
  • cos(x+y) = cos x(cos y) – sin x(sin y)
  • sin(x-y) = sin x(cos y) – cos x(sin y)
  • cos(x-y) = cos x(cos y) + sin x(sin y)

About Dr Loo - O-level & JC H2 math tutor

I am Dr Loo, a PhD holder with 8 years of teaching experience on secondary school and tertiary level specialize on mathematics and statistics. In addition, I also received teaching training under tertiary setting. Furthermore, I have published 5 research papers on international peer reviewed journals. If you are currenlty looking for mathematics tuition in Singapore, I do provide O-level Math Tutoring & JC Math Tutoring (H1 Math Tuition Class & H2 Math Tuition Class).

Thus, for those who are looking for a JC Math Tutor (H1 Math tutor or H2 Math tutor) as well as O-level Math Tutor, you may contact me for my math tuition in Singapore. I can be contacted through SMS/Whatsapp/Telegram at +65-85483705.

JC H1 H2 Math Tutor Singapore, O-level Math Tutor Singapore
O-level Math & JC Math Tuition Singapore - Trigonometric Identities
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