The exact value of $cos^273^o + cos^247^o + (cos73^o . cos47^o )$ is
The exact value of $cos^273^o + cos^247^o + (cos73^o . cos47^o )$ is
- A
$1/4$
- B
$1/2$
- C
$3/4$
- D
$1$
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- [IIT 1991]
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