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7.4 BASIC TRIG EQUATIONS PG. 564
RECALL (SUM-PRODUCT FORMULA PG. 560)
INTRODUCTION PG. 564
 An equation that contains trigonometric functions is
called a trigonometric equation.
 For example, the following are trigonometric equations:
𝑠𝑖𝑛2
𝜃 + 𝑐𝑜𝑠2
𝜃 = 1
2 sin 𝜃 − 1 = 0
tan 2𝜃 − 1 = 0
BASIC TRIGONOMETRIC EQUATIONS PG. 564
 Solving any trigonometric equation involves finding
what value of 𝜃 would make the equation true
 We do this by using algebra and all of the other
techniques we’ve learned to solve equations
EXAMPLE 1 PG. 564
 Solve the equation sin 𝜃 =
1
2
EXAMPLE 1 PG. 564
 Solve the equation sin 𝜃 =
1
2
EXAMPLE 2 PG. 565
 Solve the equation cos 𝜃 = −
2
2
, and list 8 specific solutions
EXAMPLE 2 PG. 565
 Solve the equation cos 𝜃 = −
2
2
, and list 8 specific solutions
EXAMPLE 5 PG. 567
 Find all solutions of the equations
 A) 2 sin 𝜃 − 1 = 0
 B) tan2𝜃 − 3 = 0
SOLVING TRIG EQUATIONS BY FACTORING PG. 567
 Just like we can solve equations using factoring, we
can also use factoring to solve trig equations
EXAMPLE 6 PG. 567
 Solve the equation 2cos2
𝜃 − 7 cos 𝜃 + 3 = 0
SUMMARY
 In order to solve trig equations, we first find the solutions
in one period of the function, 0 ≤ 𝜃 ≤ 2𝜋
 We then use these solutions to find all solutions
 We can also use factoring to help us solve trig equations
PRACTICE
 Pg. 569 8, 20, 32, 42, 54

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7.4 Basic Trig Equations.pptx

  • 1. 7.4 BASIC TRIG EQUATIONS PG. 564
  • 3. INTRODUCTION PG. 564  An equation that contains trigonometric functions is called a trigonometric equation.  For example, the following are trigonometric equations: 𝑠𝑖𝑛2 𝜃 + 𝑐𝑜𝑠2 𝜃 = 1 2 sin 𝜃 − 1 = 0 tan 2𝜃 − 1 = 0
  • 4. BASIC TRIGONOMETRIC EQUATIONS PG. 564  Solving any trigonometric equation involves finding what value of 𝜃 would make the equation true  We do this by using algebra and all of the other techniques we’ve learned to solve equations
  • 5. EXAMPLE 1 PG. 564  Solve the equation sin 𝜃 = 1 2
  • 6. EXAMPLE 1 PG. 564  Solve the equation sin 𝜃 = 1 2
  • 7. EXAMPLE 2 PG. 565  Solve the equation cos 𝜃 = − 2 2 , and list 8 specific solutions
  • 8. EXAMPLE 2 PG. 565  Solve the equation cos 𝜃 = − 2 2 , and list 8 specific solutions
  • 9. EXAMPLE 5 PG. 567  Find all solutions of the equations  A) 2 sin 𝜃 − 1 = 0  B) tan2𝜃 − 3 = 0
  • 10. SOLVING TRIG EQUATIONS BY FACTORING PG. 567  Just like we can solve equations using factoring, we can also use factoring to solve trig equations
  • 11. EXAMPLE 6 PG. 567  Solve the equation 2cos2 𝜃 − 7 cos 𝜃 + 3 = 0
  • 12. SUMMARY  In order to solve trig equations, we first find the solutions in one period of the function, 0 ≤ 𝜃 ≤ 2𝜋  We then use these solutions to find all solutions  We can also use factoring to help us solve trig equations
  • 13. PRACTICE  Pg. 569 8, 20, 32, 42, 54