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Find the value of cos234° - sin256° + tan2(90° - 42°) - cot242° 
1. 1
2. 0
3. 2
4. 7

1 Answer

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Best answer
Correct Answer - Option 2 : 0

Given

cos234° - sin256° + tan2(90° - 42°) - cot242° 

Formula used

cos(90° - A) = sin A

tan(90° - A) = cot A

Calculation

cos234° - sin256° + tan2(90° - 42°) - cot242° 

⇒ cos2(90° - 56°) - sin256° + cot242° - cot242° 

⇒ sin256° - sin256° + cot242° - cot242°

⇒ 0

∴ The value of cos234° - sin256° + tan2(90° - 42°) - cot242° is 0

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