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Grade: 11
`        if cos250 + sin250 =p, then cos500 is(A) ∫ 2-p2          (b) – ∫ 2-92     © p ∫ 2-p2  (d)  – p ∫ 2-p2 this symbol represent ∫  square root . pl. show the working`
4 months ago

## Answers : (1)

Vikas TU
9763 Points
```							Dear studentCos25 + Sin25 = K .........1 Cos2Q = Cos^2Q - Sin^Q => (CosQ+SinQ)(CosQ-SinQ)Square equation 1 Cos^25 +Sin^2 25 + 2Cos25*Sin25 = K^21+ sin80 = k^2Sin 80 = k^2 -1 Draw traingle and apply pythagorus theorem Cos 50 = ksqrt(2-k^2)
```
4 months ago
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