Final answer:
The SQL query to list customers who have purchased products with names beginning with "Trangia" and show their first name, last name, email address, and product name.
Step-by-step explanation:
The SQL query to list customers who have purchased products with names beginning with "Trangia" and show their first name, last name, email address, and product name is:
SELECT customer.first_name, customer.last_name, customer.email, product.name FROM customer JOIN purchase ON customer.id = purchase.customer_id JOIN product ON product.id = purchase.product_id WHERE product.name LIKE 'Trangia%';
This query uses the SELECT, JOIN, and WHERE clauses to retrieve the required information from the database.