How to Solve Algebra and Trigonometry Problems Using a Free Online Scientific Calculator
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Open the Free Scientific Calculator →Why Use an Online Scientific Calculator?
Physical scientific calculators can cost £15–£80. A free online scientific calculator runs in any browser — on your phone, tablet, or laptop — with no purchase required. It covers every function found on standard models like the Casio fx-83 or TI-30X.
Essential Functions Explained
1. Trigonometry: sin, cos, and tan
Press sin, type 30, press =. Result: 0.5. Works with cos(60°)→0.5 and tan(45°)→1. Operates in degrees by default.
2. Logarithms: log and ln
log(1000) = 3 (since 10³ = 1000). ln(2.71828) ≈ 1. Used in chemistry (pH), acoustics (decibels), and finance.
3. Square Roots and Powers
√144 = 12. Press x² to square a number: 8² = 64. Press π to insert 3.14159…
Worked Example: Pythagoras' Theorem
Given sides a=5, b=12, find c: type 5, press x² → 25, press +, type 12, press x² → 144, press = → 169, press √ → 13.
Exam Tips
- Press AC (All Clear) between problems
- Use brackets for expressions like (3+5)×2
- Estimate the answer mentally first to catch errors
- Check your question's degree vs. radian requirement
Frequently Asked Questions
Does the calculator support radians?
Currently operates in degrees. Convert: radians = degrees × (π ÷ 180).
Can I use keyboard input?
Yes — type numbers and operators on your physical keyboard for faster desktop input.
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Open Scientific Calculator →