Find partial derivatives of the function. z=ln tgx/y
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1. "Have you ( seen) the new picture by Picasso?" "Yes." "How did you ( like) it?" "I like it very much." 2. "Have you ever ( been) to Leningrad?" "Yes, I (went) there last winter." 3. "Is Father at home?" "No, he (has not come) yet." 4. I have just ( finished) work and (I'm reading) a book now. 5. "Where's your son?" "He (has not come) home from school yet. I think he is still (playing) football." 6. "When did your children ( come) back to town?" "They (have not come) back yet." 7. Have you ( done) the translation already? You only (began) it 20 minutes ago. 8. "Have you finished the work yet? Can 1 have a look at it?" "Certainly. I ( finished) it an hour ago." 9 "I have just (had) breakfast, and (I'm reading) the paper," I ( answered). "Do you ( get up) so late?" he ( said) and ( asked) me to go to his place* at once. 10. "When did you ( come) to Moscow?" "A week ago."

1. Who did you meet while you were coming to work today?
2. They will be settling the matters the whole evening tomorrow.
3. I hope, when we are in Moscow it will not be cold there.
4. Last Monday we had talks in the conference room when our Managing Director stood up and left.
5. We were discussing the terms of the contract at 10 a.m. last Wednesday.
6. The companies do not improve their devices every year.
7. Our Sales Manager is busy now. At the moment he is preparing a presentation for the sales conference.
8. Where are you going on holiday this summer?
9.My train leaves in half an hour.
10. We hope, he will translate the letter the day after tomorrow..