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# Trigonometry Help Needed

$$If\quad cosp\theta +cosq\theta =0,\\ Prove\quad that\quad the\quad different\quad values\quad of\quad \theta \quad form\quad \\ two\quad arithmetical\quad progressions\quad in\quad which\quad the\quad \\ common\quad differences\quad are\quad \frac { 2\pi }{ p+q } and\quad \frac { 2\pi }{ p-q }$$

Note by Rishi Sharma
2 years, 9 months ago

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bro @Rishi Sharma if you take 1 term to other side , you will find that the values of p and q are such adjusted that p and q lie in 1,4 quadrant or 2,3, quadrant a little simplification can give your answer easily ! :) got it ?

- 1 year, 1 month ago

Thanks @shubham dhull. I almost forgot that I ever wrote this note.

- 1 year, 1 month ago

no problem , happy to help !

- 1 year, 1 month ago

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