Asked by roger
use the sum to product formula to simplify
sin 42degrees+sin 18 degrees=sin A degrees 0<A<90 degrees
A=???degrees
sin 42degrees+sin 18 degrees=sin A degrees 0<A<90 degrees
A=???degrees
Answers
Answered by
Steve
Using the usual formulas,
sin42°+sin18° = 2 sin30° cos12°
since sin30° = 1/2, that is just
cos12° = sin78°
<u>co</u>sine means sine of the <u>co</u>mplement.
sin42°+sin18° = 2 sin30° cos12°
since sin30° = 1/2, that is just
cos12° = sin78°
<u>co</u>sine means sine of the <u>co</u>mplement.
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