what does the expression equal to? `[cos 10+sin 40]/[sin 10+cos 40]`  

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rcmath | High School Teacher | (Level 1) Associate Educator

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Apparently we don't want to use decimal approximation from a calculator, we need to start by using some trig identities to simplify.







``I am going to multiply both numerator and denominator by
cos15-sin15, we get






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