Hi,
You are going to have to purchase The Taken King Expansion again at normal price. TTK is not eligible for the Destiny Digital Upgrade Program like "The Dark Below" and "House of Wolves" are.
You can find more info on it here:
https://www.bungie.net/en/help/article/12122
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Can I buy the regular destiny and not the ttk will I be able to go on the planets and stuff?
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Oh ok... Thanks I guess PS mind sending me money😂😂