MathematicsChapter 9: Solution of Trigonometric Equations
Solving Tan X=a
Tangent has period pi, so one principal solution generates x=alpha+npi.
Learning objectives
- State the rule for solving tan x=a.
- Solve a solving tan x=a problem step by step.
- Check the result, restrictions, notation, and units.
Definition
Tangent has period pi, so one principal solution generates x=alpha+npi.
Mathematical form
tan x=1 gives x=pi/4+npi.
x=alpha+npi. Worked example
x=1 gives x
Where / symbols
- Solving tan x=a
- Tangent has period pi, so one principal solution generates x=alpha+npi.
Relationship
- Solving tan x=a
CONCEPT AND RULE
Tangent has period pi, so one principal solution generates x=alpha+npi.
METHOD
For solving tan x=a, identify the given information and required result. Select the matching definition or formula, state its conditions, substitute carefully, simplify one line at a time, and check.
WORKED EXAMPLE
tan x=1 gives x=pi/4+npi.
COMMON MISTAKE
Write the governing rule before substitution, keep brackets and signs visible, and check that the answer satisfies all domain or interval conditions.
How to solve solving tan x=a
- Identify the mathematical objects, givens, restrictions, and required result.
- Choose and write the relevant definition, theorem, or formula.
- Substitute with brackets and carry out one justified step per line.
- Simplify, state the final answer clearly, and verify it in the original setting.
Worked example
- Worked example:
- tan x=1 gives x=pi/4+npi.
In simple words
Write the governing rule before substitution, keep brackets and signs visible, and check that the answer satisfies all domain or interval conditions.
Key points
- Solving tan x=a
- rule
- worked example
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Solving Tan X=a
Sticky Notes · Formula and Worked Revision
Core Idea
- Tangent has period pi, so one principal solution generates x=alpha+npi.
Rule / Formula
- Tangent has period pi, so one principal solution generates x=alpha+npi.
Method
- Identify givens and restrictions.
- Write the rule.
- Substitute and simplify.
- Check the result.
Worked Example
- tan x=1 gives x=pi/4+npi.
Common Error
- Write the governing rule before substitution, keep brackets and signs visible, and check that the answer satisfies all domain or interval conditions.
FBISE Exam Tip
- Show the formula, substitutions, algebra, restrictions, and final answer; method marks need visible reasoning.
60-second revision
- Tangent has period pi, so one principal solution generates x=alpha+npi.
- Worked pattern: tan x=1 gives x=pi/4+npi.
- Final check: domain, sign, notation, units, and reasonableness.
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