Valmiki Ramayana Kishkindha Kanda Sarga 33 Shloka 32
Original Shlokaकिन्नु तत्कारणं सुभ्रु प्रकृत्या मृदुमानसः। सरोष इव सम्प्राप्तो येनायं राघवानुजः।।4.33.32।।
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सुभ्रु O lady with beautiful eyebrows, प्रकृत्या by nature, मृदुमानसः softhearted, अयम् this person, राघवानुजः Rama's younger brother, येन since, सरोष इव as though angry, सम्प्राप्तः has come, तत्कारणम् its cause, किं नु what is it?
'O Tara with beautiful eyebrows this younger brother of Rama is normally softhearted. But today he arrived here angry. What could be the reason?