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Subject > Math > Trigonometry > Question and Answers 4

Trigonometry



Question (1):
Answer:

Question (2):
Answer:

Question (3):
Answer:

Question (4):
Answer:

Question (5):
Answer:

Question (6): If A+B=45, prove that (1 + tan A) (1 + tan B) = 2.
Answer:

Question (7):
Answer:

Question (8):
Answer:

Question (9): Prove that tan 70^o = tan 20^o + 2 tan 50^o.
Answer:

Question (10):
Answer: By data: By componendo and dividendo

Question (11):
Answer:

Question (12):
Answer: Squaring and adding

Question (13): Evaluate:
Answer:

Question (114): Evaluate:
Answer:

Question (15): Evaluate:
Answer:

Question (16): Evaluate:
Answer:

Question (117):
Answer:

Question (18): Prove that cot q - tan q = 2cot 2q.
Answer: Aliter:

Question (19):
Answer:

Question (20): Prove that 4 sin 18^o cos 36^o = 1.
Answer: LHS = 4 cos 72^o cos 36^o

Question (21):
Answer:

Question (22):
Answer:

Question (23): Prove that sin 3q - sin q - sin 5q = sin 3q (1 - 2 cos 2q).
Answer: LHS = sin 3q - (sin 5q + sinq) = sin 3q - (2 cos 2q sin3q) = sin 3q (1 - 2 cos 2q)

Question (24):
Answer:

Question (25):
Answer:

Question (26):
Answer:

Question (27): Prove that cos 5^o - sin 25^o = sin 35^o.
Answer: =2sin30sin35

Question (28): Prove that cos 80^o + cos 40^o - cos 20^o = 0.
Answer:

Question (29):
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Question (30):
Answer:

Question (31):
Answer:

Question (32):
Answer:

Question (33):
Answer:

Question (34):
Answer: let A=15

Question (35):
Answer:

Question (36): Prove that
Answer:

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Trigonometry

	Trigonometry
	Trigonometrical Identities
	Trigonometric Tables
	Trigonometry XI
	Trigonometry (Continued)
	Solution of Right Angled Triangles
	Heights and Distances
	Question and Answers 1
	Question and Answers 2
	Question and Answers 3
	Question and Answers 4

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