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*Try it free. With the free download, you can explore five learning activities or tutoring recommendations. When your trial activities are exhausted, you’ll need to subscribe at the then-current rate in order to access all of Aida Calculus’ content and features. Subscriptions will auto-renew unless cancelled. Subscriptions are handled through Apple Inc. and your billing relationship is directly with Apple, including your billing information, payment method, renewal, and cancellation.