الهويات المثلثية لزوايا الجمع والطرح
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Questions and Answers

أثبت أن tan (π/4 + θ) يساوي [1 + tan θ] / [1 - tan θ]

tan (π/4 + θ)= [tan π/4 + tan θ ]/ [1- tan π/4 tan θ] = [1 + tan θ]/[1 - tan θ]

أثبت أن sin (90°-θ) يساوي Cos θ.

sin(90°-θ)= cos θ.

أثبت أن Cos (π/2 + θ) يساوي - Sin θ .

Cos (π/2 + θ) = - Sin θ.

أثبت أن Sin( θ + π) يساوي - Sin θ .

<p>Sin (θ + π) = Sin θ Cos π + Cos θ Sin π= Sin θ (-1)+ Cos θ (0) = - Sin θ.</p> Signup and view all the answers

أثبت أنّ [sin A + tan θ cos A]/[cos A - tan θ Sin A] يساوي tan(A + θ).

<p>[sin A + tan θ cos A]/[cos A - tan θ Sin A] = [Sin A + Sin θ / Cos θ Cos A]/[Cos A - Sin θ / Cos θ Sin A] = [Sin A Cos θ+ Sin θ Cos A]/[Cos A Cos θ - Sin θ Sin A] = [Sin (A + θ)] / [Cos (A + θ)] = tan(A + θ)</p> Signup and view all the answers

بسّط العبارة sin (π/5 - θ) cos (π/5 + θ) - cos (π/5 - θ) sin (π/5 + θ) دون استخدام مفكوك المجموع أوّ الفرق.

<p>sin (π/5 - θ) cos (π/5 + θ) - cos (π/5 - θ) sin (π/5 + θ) = Sin( (π/5 - θ) - (π/5 + θ)) = Sin(-2θ) = -Sin 2θ.</p> Signup and view all the answers

أوجد قيمة d التي تُمثل المسافة بين النقطتين (Cos B, Sin B), (Cos A, Sin A) ، حيث أنّ A, B زاويتان في الوضع القياسي ؟

<p>d= √ [(Cos A - Cos B)² + (Sin A - Sin B)²] = √[Cos²A - 2Cos A Cos B + Cos²B + Sin²A - 2Sin A Sin B + Sin²B] = √[2 - 2(Cos A Cos B + Sin A Sin B)] = √[2 - 2Cos (A-B)]</p> Signup and view all the answers

ما القيمة الدقيقة للعبارة sin(60° + θ) cos θ - cos(60° + θ) sin θ ؟

<p>1/2</p> Signup and view all the answers

إذا كانت Cos θ + 0.3 = 0 و π < θ < 3π/2 ، فما القيمة الدقيقة لـ Cot θ؟

<p>Cos θ = -0.3 . Sin² θ = 1 - Cos² θ = 0.91 . بما أنّ θ في الربع الثالث ، فإن Sin θ = -√0.91= - √91/10. Cot θ = Cos θ/Sin θ= -0.3/-√91/10 = 3/√91 او 3√91/91 .</p> Signup and view all the answers

Study Notes

Trigonometric Identities for the Sum and Difference of Two Angles

  • Identities for tan(θ₁ ± θ₂):

    • tan(θ₁ + θ₂) = (tan θ₁ + tan θ₂)/(1 - tan θ₁ tan θ₂)
    • tan(θ₁ - θ₂) = (tan θ₁ - tan θ₂)/(1 + tan θ₁ tan θ₂)
  • Identity for sin(90°–θ):

    • sin(90° - θ) = cos θ
  • Identity for cos(θ₁ ± θ₂): (No specific formulas are provided, but information related to these may be found elsewhere in the given text)

  • Identity for sin(θ₁ ± θ₂): (No specific formulas are provided, but information related to these may be found elsewhere in the given text)

  • Identity for sin(θ+π):

    • sin(θ + π) = -sin θ
  • Identity for cos(½θ):

    • cos(½θ) = -sin θ (Note that this appears to be incomplete or incorrect form of the identity)
  • Identity for sin(θ+A):

    • sin(θ+A) = sin θ cos A + cos θ sin A
  • Relationship Between sin, cos, and tan:

    • sin A + tanθ cos A = tan(A+θ) / cos A - tanθsin A

Understanding Trigonometric Identities

  • Identities are used to prove others.
  • Identities are used to simplify expressions and solve problems.

Determining Trigonometric Values in Specific Quadrants of the Unit Circle.

  • Information on specific quadrants and angles. (Specific examples of these angles or quadrants are not included in the provided text.)

Applying Trigonometric Identities

  • Find the exact value of expressions like sin(60° + θ) cos θ - cos(60° + θ) sin θ
  • Given identities, show work to find exact values.
    • Example calculation: sin(60° + θ) cos θ - cos(60° + θ) sin θ = sin(60° - θ)

Special Values of Trigonometric Functions

  • Formulas may be required to find values given, such as cot θ and cos θ
  • Provide the formulas, cot θ and cos θ and work examples to show the values.

Solving for Angles using Trigonometric Functions

  • Determining an angle if cosθ + 0.3 = 0. (Values for other trigonometric functions may be involved).
  • Given an angle within a specific range, provide the necessary steps and values of trigonometric functions/identities involved. Example: If π < θ < 3π/2.

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Description

استكشف الهويات المثلثية المرتبطة بجمع وطرح الزوايا. سيساعدك هذا الاختبار على فهم كيفية تطبيق هذه الهويات في مسائل الرياضيات المختلفة. مثالي للطلاب الذين يدرسون الهندسة أو الوظائف المثلثية.

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