prove that; 4cos^3 20+sin^3 10=3(cos 20+sin10)
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Here is the soln in the attached file
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4(cos^3 10+sin^3 20)
=4cos^3 10+4sin^320
=cos30+3cos10+3sin20-sin60
=3cos10+3sin20
=3(cos10+sin20)
(prove)
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