मूल बिंदु से बिन्दुओ ( cos theta ,si...

मूल बिंदु से बिन्दुओ `( cos theta ,sin theta )` और `( cos phi , sin phi ) ` को मिलाने वाले रेखा की लंबिक दुरी ज्ञात कीजिए ।

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cos 2 (theta+ phi) +4 cos (theta + phi ) sin theta sin phi + 2 sin ^(2) phi=

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