(key Q13)

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MHF 4UB Unit Ill Workbook 24 KEY QUESTIONS Lesson 13 1. Knowledge/Understanding [6 marks] Simplify: sin x Ian * COST sin Zx bij 1-006 2x 4sin =cos; 2 2. Communication [6 marks] Show how you can use the compound and double angle formulas to find an expression for EITHER sin 30 OR cos30.3. Application [4, 4 marks] Prove the following identities: a) tan x +- 1 tanx sinxcosx b) tand-1=- sin 8-cosa sin Ocosd + cos' e4. Application [S marks] If cosd -2 Of 8