MCQ
Which hormone is secreted by the pineal gland?
- AVasopressin
- BProlactin
- ✓Melatonin
- DOxytocin
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`bar"r" = (hat"i" + 2hat"j" + hat"k") + lambda (hat"i" - hat"j" + hat"k")` and
`bar"r" = (2hat"i" - hat"j" - hat"k") + mu(2hat"i" + hat"j" + 2hat"k")` is