RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 7. Values of Trigonometric Functions at Sum of Difference of Angles

Subject: Maths - Class 11th

Q. No. 3 of Exercise 7.2

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3

Show that Sin 1000 – Sin 100 is positive.

Let f(x) = sin 100° – sin 10°


Dividing And multiplyingBy √(1 + 1) = √2,





We know that cosA cosB – sinA sinB = cos(A +B)



f(x) = √2 cos 55°


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