• تَدْرُسُونَ
• دِرَاسَتهِمْ
• دَرَسْتَ
• دَرَسُوا۟
• يَدْرُسُونَهَا

Appears 6 times in the Quran.

1. 3:79 مَا كَانَ لِبَشَرٍ أَن يُؤْتِيَهُ ٱللَّهُ ٱلْكِتَٰبَ وَٱلْحُكْمَ وَٱلنُّبُوَّةَ ثُمَّ يَقُولَ لِلنَّاسِ كُونُوا۟ عِبَادًا لِّى مِن دُونِ ٱللَّهِ وَلَٰكِن كُونُوا۟ رَبَّٰنِيِّۦنَ بِمَا كُنتُمْ تُعَلِّمُونَ ٱلْكِتَٰبَ وَبِمَا كُنتُمْ تَدْرُسُونَ

   It is not meet for a mortal that Allah should give him the Book and the wisdom and prophethood, then he should say to men: Be my servants rather than Allah's; but rather (he would say): Be worshippers of the Lord because of your teaching the Book and your reading (it yourselves).
   

2. 6:105 وَكَذَٰلِكَ نُصَرِّفُ ٱلْءَايَٰتِ وَلِيَقُولُوا۟ دَرَسْتَ وَلِنُبَيِّنَهُۥ لِقَوْمٍ يَعْلَمُونَ

   And thus do We repeat the communications and that they may say: You have read; and that We may make it clear to a people who know.
   

3. 6:156 أَن تَقُولُوٓا۟ إِنَّمَآ أُنزِلَ ٱلْكِتَٰبُ عَلَىٰ طَآئِفَتَيْنِ مِن قَبْلِنَا وَإِن كُنَّا عَن دِرَاسَتِهِمْ لَغَٰفِلِينَ

   Lest you say that the Book was only revealed to two parties before us and We were truly unaware of what they read.
   

4. 7:169 فَخَلَفَ مِنۢ بَعْدِهِمْ خَلْفٌ وَرِثُوا۟ ٱلْكِتَٰبَ يَأْخُذُونَ عَرَضَ هَٰذَا ٱلْأَدْنَىٰ وَيَقُولُونَ سَيُغْفَرُ لَنَا وَإِن يَأْتِهِمْ عَرَضٌ مِّثْلُهُۥ يَأْخُذُوهُ أَلَمْ يُؤْخَذْ عَلَيْهِم مِّيثَٰقُ ٱلْكِتَٰبِ أَن لَّا يَقُولُوا۟ عَلَى ٱللَّهِ إِلَّا ٱلْحَقَّ وَدَرَسُوا۟ مَا فِيهِ وَٱلدَّارُ ٱلْءَاخِرَةُ خَيْرٌ لِّلَّذِينَ يَتَّقُونَ أَفَلَا تَعْقِلُونَ

   Then there came after them an evil posterity who inherited the Book, taking only the frail good of this low life and saying: It will be forgiven us. And if the like good came to them, they would take it (too). Was not a promise taken from them in the Book that they would not speak anything about Allah but the truth, and they have read what is in it; and the abode of the hereafter is better for those who guard (against evil). Do you not then understand?
   

5. 34:44 وَمَآ ءَاتَيْنَٰهُم مِّن كُتُبٍ يَدْرُسُونَهَا وَمَآ أَرْسَلْنَآ إِلَيْهِمْ قَبْلَكَ مِن نَّذِيرٍ

   And We have not given them any books which they read, nor did We send to them before you a warner.
   

6. 68:37 أَمْ لَكُمْ كِتَٰبٌ فِيهِ تَدْرُسُونَ

   Or have you a book wherein you read,