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The value of cos 10 ° cos 30° cos 50° cos 70° cos 90° is: |
3 0 5 1 |
0 |
cos 10 ° cos 30° cos 50° cos 70° cos 90° { we know, cos 90° = 0 } = cos 10° × cos 30° × cos 50° × cos 70° × 0 = 0 |
