# Answer to Question #44504 in Trigonometry for suboorkareema

Question #44504

THS IS FUNCTIONS (CHAPTER ;RELATION BETWEEN SIDES AND ANGle or using sine formula show that each of the following holdand the law of sine rule

Q1 .tan A-B/2/TAN A+B/2=a-b/a+b

Q2 .b cos B+c cos C=a cos (B-C)

Q3 a sin B-C/2\=(b-c) cos A/2

Q4 b+c/b-c=tan B+C/2 * COT B-C/2

Q5 a cosA+b cos C+c cos C=2a sinB sinC

Q5. IN ANY TRIANGLE IF a/ cosA=b/cosB, PROVE THAT THE TRIANGLE IS ISOSCELES

Q1 .tan A-B/2/TAN A+B/2=a-b/a+b

Q2 .b cos B+c cos C=a cos (B-C)

Q3 a sin B-C/2\=(b-c) cos A/2

Q4 b+c/b-c=tan B+C/2 * COT B-C/2

Q5 a cosA+b cos C+c cos C=2a sinB sinC

Q5. IN ANY TRIANGLE IF a/ cosA=b/cosB, PROVE THAT THE TRIANGLE IS ISOSCELES

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