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Transcript

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00:00 - 00:59 | in this question we are given that cos alpha + cos beta is equal to zero is equals to sin alpha + sin b and b have to calculate cos 12 cos 2 Beta latest first rewrite the conditions we are give cause and + cos theta is equal to zero sin alpha + sin theta is equals to now what will I do in first we will have cos alpha + cos theta whole square equal to zero is a + b whole square so this will be a square + |

01:00 - 01:59 | b square + 2 Y equal to zero this is my first equation now here also sin alpha + sin theta = 20 now again here also I am so this will be + 2 sin and equal to calculate cost of letters that disease causes |

02:00 - 02:59 | alpha + sin square x Cos 2 alpha in terms of Cos and sin letter cried cos 2 alpha whether we have formula cos square theta minus sin square theta cos 2 alpha get cos square alpha minus sin square alpha and that how I will from equation 1 cos square alpha minus sin square alpha I am taken together |

03:00 - 03:59 | cos squared theta minus sin square beta value and face value the remaining values and taking to former then I will left with Alpha cos beta minus sin alpha and beta 0 - 0 will be now this is I have written this will be cause to be this is cos cos Y minus sin a sin b form |

04:00 - 04:59 | I can write cos alpha + beta so from here but I get cos 2 alpha + cos 2 theta will be - 2 cos beta now let's check out the options minus cos alpha + beta is option B is the correct and done thank you |