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CBSE Class 11-science Answered

cos 840 find the value
Asked by ramakoti61 | 09 Jul, 2018, 08:45: PM
answered-by-expert Expert Answer
cos(840º) = cos (90º × 7 + 30º)
               = -sin30°
               = -1/2 = - 0.5
Answered by Sneha shidid | 11 Jul, 2018, 10:49: AM

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CBSE 11-science - Maths
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