find the value cos68cos38 - sin68sin38
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use formula ,
cos (A + B) = cosA.cosB - sinA.sinB
A = 68°
B= 38°
cos68°.cos38° -sin68°.sin38°
according to formula,
cos (68° -38°) = cos30° = root3/2
cos (A + B) = cosA.cosB - sinA.sinB
A = 68°
B= 38°
cos68°.cos38° -sin68°.sin38°
according to formula,
cos (68° -38°) = cos30° = root3/2
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