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The value of $$ cos {20^o} cos {40^o}cos {60^o}cos {80^o}$$ is:
5Q:
The value of $$ cos {20^o} cos {40^o}cos {60^o}cos {80^o}$$ is:
- 1$$ {1\over 15}$$false
- 2$$ {1\over 16}$$true
- 3$$ {1\over 12}$$false
- 4None of thesefalse
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