exam Maths Puzzle Numerical Ability

(x squared + 5y)a + 6(x squared + 5y)

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The Radius of the earth at the equator is approximately 4000 miles. Suppose a jet flies once around the earth at a speed of 500 miles an hour relative to earth. If the flight pat I am a grade 10 student and we have read abt multiple and sub multiple angles..
I have problem with this questions..I hope that my question will be answered

prove that:
sin6.sin42.sin66.sin78=(1/16)