Flashcards
Compound angle formulae
Cards in this deck (15)
- 1—
- 2—
- 3—
- 4—
- 5When asked to find the exact value of sin, cos or tan, what should you look for?Right-angled triangles.
- 6If a right-angled triangle is not involved, what should you do?Try to make an expression up which involves right-angled triangles and exact values you know (eg. 30, 45, 60 degrees).
- 7—Draw a right angled triangle, use Pythagoras to find the missing side, then use SOHCAHTOA.
- 8—
- 9—
- 10—
- 11—
- 12When solving a trig equation, what two-step process should you follow?Is it a "straight-forward solve"?
If not, then "double angle solve". - 13How do you recognise and solve a "straight-forward solve"?Sin, Cos or Tan appears once only; solve to find acute angle, then use ASTC.
- 14How do you recognise and solve a "double-angle solve"?Look for a double angle and a single angle (eg 2A and A).
Replace the double-angle formula with an appropriate single expression, then make one side zero and factorise in order to solve. - 15What should you always check at the end of a trig question?Check whether the answer should be given in degrees or radians.
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- Higher Maths Flashcards on Compound angle formulae, created by Meg McAteer on 11/04/2016.
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- Meg McAteer
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