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2-cos^2x-3sinxcosx

25/04/2023 at 3:49 pm (last edited 25/04/2023 at 3:50 pm)

01/02/2023 at 7:50 am (last edited 01/02/2023 at 8:07 am)

Without using a calculator, find the values of x such that cos 2x = sin 230⁰, where -180⁰ ≤ x ≤ 180⁰ .

06/08/2020 at 7:53 pm (last edited 06/08/2020 at 7:53 pm)