Write the complex number in trigonometric form r(cos 0+ i sin 0), with 0 in the interval [0°,360°). 1+ 3 i ... 1+ 3 i=(cos i sin ) (Type the value for r as an exact answer, using radicals as needed. Type the value for 0 as an integer or decimal rounded to the nearest tenth as needed.)

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A: The addition formula for cosine is given by cos(a + b) = cos a cos b – sin a sin b

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A: The given complex number z4=2+6i4. We have to write this number in trigonometric form.

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Q: Perform the indicated operation and write the result in standard form. Select all values that are…

A: Given the query is to the correct option for the given expression.