Using the formula, CosA = root((1+Cos2A)/2), find Cos30 if Cos60=1/2 /Trigonometry Doubt

19. Using the formula, sin A = sqrt((1 - cos 2A)/2 find the value of sin 30 it being given that...

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18. Using the formula, cosA=√1+cos2A/2, find the valuenof cos30°.

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Using the formula, sinA = root(1-Cos2A/2), find the value of sin30°, given cos60° = 1/2 | RS 10

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Using the formula, sin A=√(1-cos 2 A/2), find the value of sin 30^∘, it being given that cos 60^∘...