6a M1 1.1b 7th Use addition Usesandto A2 2.2a formulae and/or Award one mark for each correct use of a trigonometric double-angle identity. formulae to solve equations. (3) 6b States that: B1 2.2a 7th Use addition Simplifies this to write: M1 1.1b formulae and/or double-angle Correctly finds M1 1.1b formulae to solve Additional answers might be seen, but not necessary in order to equations. award the mark. States A1 1.1b Note that. For these values 3θ lies in the third quadrant, thereforeandare both negative and cannot be equal to a positive surd. (4) (7 marks) Notes 6b Award all 4 marks if correct final answer is seen, even if some of the 6θ angles are missing in the preceding step. Pearson Progression Step Q Scheme Marks AOs and Progress descriptor States: 1.1b 6th 7a M1 Understand how to use identities Or: to rewrite acosx + bsinx. Deduces that: M1 1.1b States that A1 1.1b Use of might be seen, but is not necessary to award the mark. Finds that A1 1.1b
6a M1 1.1b 7th Use addition formulae and/or double-angle formulae to solve equations. Usesandto Award one mark for each correct use of a trigonometric identity. A2 2.2a (3) 6b States that: B1 2.2a 7th Use addition formulae and/or double-angle formulae to solve equations. Simplifies this to write: M1 1.1b Correctly finds Additional answers might be seen, but not necessary in order to award the mark. M1 1.1b States Note that. For these values 3θ lies in the third quadrant, thereforeandare both negative and cannot be equal to a positive surd. A1 1.1b (4) (7 marks) Notes 6b Award all 4 marks if correct final answer is seen, even if some of the 6θ angles are missing in the preceding step. Q Scheme Marks AOs Pearson Progression Step and Progress descriptor 7a States: Or: M1 1.1b 6th Understand how to use identities to rewrite acosx + bsinx. Deduces that: M1 1.1b States that Use of might be seen, but is not necessary to award the mark. A1 1.1b Finds that A1 1.1b
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