On taking the reciprocals we get Substitute the value of AC and BC in the above expression to get; Now, as per the question, we need to find the value of cos A and tan A. cos A = Adjacent Side/Hypotenuse side = AB/AC, tan A = Opposite side/Adjacent side = BC/AB. They will come across many trigonometric formulas which will be used to solve numerical problems. Thanks to BYJU’S App. Below are the important questions for class 10th students of CBSE board based on chapter 8-Introduction to Trigonometry. The values of LHS and RHS are the same. Thank you, BYJU’S ! =(1-sinA/cosA)²/(1-cosA/sinA)² (i) sin A, cos A As we all know "Practice makes a man perfect" so, more you practice , better you perform. Solving these questions will help students to get prepared for the final exam. Thank you byjus. To check: (1-tan2A)/(1+tan2A) = cos2 A – sin2 A or not, (1-tan2A)/(1+tan2A) = [1 – (3/4)2]/ [1 + (3/4)2], R.H.S. Thank you Byju’s this helped me a lot in my internal assessments. = tan²A In Chapter 8, students will be introduced with Trigonometry concept, which states the relationship between angles and sides of a triangle. Introduction to Trigonometry Class 10 Extra Questions Maths Chapter 8 with Solutions Answers August 18, 2020 by Prasanna Leave a Comment Here we are providing Introduction to Trigonometry Class 10 Extra Questions Maths Chapter 8 with Answers Solutions, Extra Questions for Class 10 Maths was designed by subject expert teachers. Find the lengths of all sides of the right triangle below if its area is 400. Please upload more questions similar to this with a little bit more complexity. Hence, putting these values in the given equation, we get; Question 9: If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A. Solution: Find x and H in the right triangle below. Therefore. Please upload the most important EXERCISE QUESTIONS and EXAMPLE QUESTIONS from textbook as well. We can also write the above given tan functions in terms of cot functions, such as; We can also write the given cos functions in terms of sin functions. =(cosA-sinA)²×sin²A /Cos²A. Solve these questions and for any queries please drop your comments at the end of the section. Concepts covered in Chapter 8 include trigonometric ratios, trigonometric ratios of complementary angles, trigonometric identities. Download MCQs for Class 10 Trigonometry for important topics for all chapters in Class 10 Trigonometry based on CBSE and NCERT pattern. Substituting the above equation in the given equation, we get; Question 10:  If A, B and C are interior angles of a triangle ABC, then show that sin [(B + C)/2] = cos A/2. 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