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`        If tan A + cot A = 4; then find  tan^4 A + cot^4 A= ?? `
2 years ago

```							Dear student tan(a) + cot(a) = 4 [tan(a) + cot(a)]² = 16 tan²(a) + 2tan(a).cot(a) + cot²(a) = 16 tan²(a) + 2 + cot²(a) = 16 tan²(a) + cot²(a) = 14 [tan²(a) + cot²(a)]² = 196 tan^4(a) + 2tan²(a).cot²(a) + cot^4(a) = 196 tan^4(a) + 2 + cot^4(a) = 196 tan^4(a) + cot^4(a) = 194   RegardsArun (askIITians forum expert)
```
2 years ago
```							Dear student tan(a) + cot(a) = 4  [tan(a) + cot(a)]² = 16  tan²(a) + 2tan(a).cot(a) + cot²(a) = 16  tan²(a) + 2 + cot²(a) = 16  tan²(a) + cot²(a) = 14  [tan²(a) + cot²(a)]² = 196  tan^4(a) + 2tan²(a).cot²(a) + cot^4(a) = 196  tan^4(a) + 2 + cot^4(a) = 196  tan^4(a) + cot^4(a) = 194   RegardsArun (askIITians forum expert)
```
2 years ago
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