- sinθ= लম্ব/অতিভূজ।
- cosθ= ভূমি/অতিভূজ।
- taneθ= लম্ব/ভূমি।
- cotθ= ভূমি/লম্ব।
- secθ= অতিভূজ/ভূমি।
- cosecθ= অতিভূজ/লম্ব।
- sinθ= 1/cosecθ, cosecθ=1/sinθ
- cosθ= 1/secθ, secθ=1/cosθ
- tanθ= 1/cotθ, cotθ=1/tanθ
- sin²θ + cos²θ= 1
- sin²θ = 1 – cos²θ
- cos²θ = 1- sin²θ
- sec²θ – tan²θ = 1
- sec²θ = 1+ tan²θ
- tan²θ = sec²θ – 1
- cosec²θ – cot²θ = 1
- cosec²θ = cot²θ + 1
- cot²θ = cosec²θ – 1
