1c:I[1254,["7330","static/chunks/d3ac728e-78c3d5d7a486ed3a.js","5159","static/chunks/5159-48592f0bf1a47f9d.js","8175","static/chunks/8175-f84d59b9bd013e10.js","8167","static/chunks/8167-b25693a0140130f2.js","664","static/chunks/664-bceb0f356f9312eb.js","3703","static/chunks/app/practice-question/%5Bslug%5D/page-d1408559b663b83f.js"],"PracticeQuestionCard"] 1b:T494,{"@context":"https://schema.org","@type":"QAPage","name":"If a = 45° and b = 15°, what is the value of ( a - b ) - ( a + b ) (…","url":"https://vidyalelo.com/practice-question/if-a-45-and-b-15-what-is-the-value-of-cos-a-b-cos-a-b-cos-a-b-255039","keywords":"practice questions, MCQ, MCQs with answers, objective questions, competitive exam questions, Competitive Exams, Competitive Exams MCQ, Competitive Exams MCQs, Competitive Exams questions, Competitive Exams practice questions, Aptitude, Aptitude MCQ, Aptitude MCQs, Aptitude questions, Aptitude practice questions, Trigonometry","mainEntity":{"@type":"Question","name":"If a = 45° and b = 15°, what is the value of ( a - b ) - ( a + b ) (…","text":"If a = 45° and b = 15°, what is the value of ( a - b ) - ( a + b ) ( a - b ) + ( a + b )?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Option D. 2 - √3. Answer & Solution Answer: Option D Solution: & ( a - b ) - ( a + b ) ( a - b ) + ( a + b ) & = ( 45^ - 15^ ) - ( 45^ + 15^ ) ( 45^ - 15^ ) + ( 45^ + 15^ ) & = 30^ - 60^ 30^ + 60^ & = 3 2 - 1/2 3 2 + 1/2 & = ( 3 - 1 ) ( 3 + 1 ) × ( 3 - 1 ) ( 3 - 1 ) & = 3 + 1 - 2 3 2 & = 4 - 2 3…"}}}1d:T518,

Answer & Solution

Answer: Option D

Solution:

$$\eqalign{ & \frac{{\cos \left( {a - b} \right) - \cos \left( {a + b} \right)}}{{\cos \left( {a - b} \right) + \cos \left( {a + b} \right)}} \