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Use the verb in the proper tense: Present Perfect or Past Simple:

1.I (write) to Deborah recently.

2.Jill (arrive) a week ago.

3.Someone (eat) all the cakes. I’ll have to buy some more.

4.What (you buy) your sister for her birthday?

5.I (do) everything you asked. What should I do now?

6.(You give) Helen my message when you (see) her?

7.The police think that they (find) your wallet, so call this number.

8.(You two meet) before?

9.(You meet) anyone interesting at the reception?

10.I’m phoning about your bicycle for sale, which I (see) in the local paper.

помогите пожалуйста решить 10sin2x+2,  если cos2x=0,5.