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![SOLVED: QUESTION 1 [15 marks] (a) Without using a calculator, find the exact value of Cos2550 cos1950 cos(1809) [Hint: Use sum-to-product formula to simplify]: [3] (b) Without using calculator; find the exact](https://cdn.numerade.com/ask_images/4cea4ddc81a94fde914f2e43ee3c462f.jpg "SOLVED: QUESTION 1 [15 marks] (a) Without using a calculator, find the exact value of Cos2550 cos1950 cos(1809) [Hint: Use sum-to-product formula to simplify]: [3] (b) Without using calculator; find the exact")