cos² 45° + sin² 30° cos45 = 1/√2 sin 30 = ?
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cos 45 = 1/ root 2. sin 30 = 1/2. cos^2 45 + sin ^2 45. = (1 / root 2)^2 + (1/2)^2. = 1/2 + 1/4. = 2/4 + 1/4. = 3/4.
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