Class XI Chapter 3 – Trigonometric Functions Maths ______________________________________________________________________________ 1 2 1 2 4 2 1 4 1 3 1 2 4 2 2 = R.H.S. Question 3: Prove that Solution 3: L.H.S. = 5 6 6 6 2 2 cot cosec 3tan 6 2 5 2 cot cosec 3tan 6 6 6 2 1 3 cosec 3 6 3 1 3 cosec 3 6 3 3 21 6 R.H.S 2 Question 4: Prove that Solution 4: L.H.S. 3 4 4 3 2 2 2 2sin 2cos 2sec 10 2 3 2 2 2sin 2cos 2sec 4 4 3 2 2 1 2sin 2 2 2 4 2 1 2sin 2 8 4 2 **11** 8 = 10 = R.H.S 2 2 Printed from Vedantu.com. Register now to book a Free LIVE Online trial session with a Top tutor.

Class XI Chapter 3 – Trigonometric Functions Maths ______________________________________________________________________________ Question 5: Find the value of : (i) sin75 (ii) Solution 5: (i) tan15 sin 75 sin 45 30 sin 45 cos30 cos45 sin30 sin x y sin xcos y cos xsin y 1 3 1 1 2 2 22 3 1 3 1 2 2 2 2 2 2 (ii) tan15 tan 45 30 tan 45 tan30 tan tan x tan y x y 1 tan 45 tan30 1 tan xtan y 1 3 1 1 3 3 1 31 **11** 3 3 2 31 2 3 1 3 1 2 3 31 3 1 3 1 3 1 4 2 3 2 3 31 2 Question 6: 4 4 4 4 Prove that cos x cos y sin x sin y sin x y Solution 6: cos x cos y sin x sin y 4 4 4 4 Printed from Vedantu.com. Register now to book a Free LIVE Online trial session with a Top tutor.

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