perform the operation and leave in trigonometric form: (cos 5°+i sin 5°)(cos 20°+i sin 20°)
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Originally Posted by kassums17 perform the operation and leave in trigonometric form: (cos 5°+i sin 5°)(cos 20°+i sin 20°) At least tell us what you do not understand about this.
how do you find the cos of 5 degrees and the cos of 20 degrees?
Originally Posted by kassums17 how do you find the cos of 5 degrees and the cos of 20 degrees? There is no need to bother with that. What does $\displaystyle \left[ {r(\cos (\phi ) + i\sin (\phi ))} \right]\left[ {s(\cos (\theta ) + i\sin (\theta ))} \right] = ~?$
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