cos 68° cos 8° + sin 68° sin 8° = ?
- a)1/2
- b)1/4
- c)1
- d)0
Correct answer is option 'A'. Can you explain this answer?
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Answers
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Meenakshi B Pillai
Jun 21, 2018 |
According to trigonometric functions cos A cos B + sin A sin B = cos (A-B) Therefore let A=68 and B=8 => cos (68-8) = cos 60 = 1/2 Hope you understand this.......
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Shivani
Jun 11, 2018 |
CosAcosB+sinAsinB=cos(A-B).....here A=68...B=8....cos68cos8+sin68sin8=cos(68-8)=cos60=1/2....option A HOPE U GOT IT...
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Yogesh Singla
Jun 21, 2018 |
Yes as it becomes the formula of cos(a-b). so cos(68-8)= cos(60) = 1/2
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Pioneer Academy
Feb 18, 2022 |
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We know,
cosA cosB + sinA sinB = cos(A-B)
cosA cosB + sinA sinB = cos(A-B)
cos 68° cos 8° + sin 68° sin 8° = Cos (68-8) = Cos60°
=1/2
=1/2
According to trigonometric functions cos A cos B + sin A sin B = cos (A-B) Therefore let A=68 and B=8 => cos (68-8) = cos 60 = 1/2 Hope you understand this.......
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According to trigonometric functions cos A cos B + sin A sin B = cos (A-B) Therefore let A=68 and B=8 => cos (68-8) = cos 60 = 1/2 Hope you understand this.......
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