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Evaluate \(\int_7^9\)cos⁡(x)dx.(a) 8 (-sin 9 – sin 7)(b) 8 (sin 9 + sin 7)(c) 8 (sin 9 – sin 7)(d) 7 (sin 9 – sin 7)I had been asked this question by my college director while I was bunking the class.This question is from Definite Integral topic in portion Integrals of Mathematics – Class 12

Answer» RIGHT answer is (c) 8 (sin 9 – sin 7)

The BEST I can explain: \(\int_7^9\)8cos⁡(x)DX = 8 \(\int_7^9\)cos⁡(x)dx

= 8 (cos x)^97

= 8 (sin 9 – sin 7)


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