Question

1+ tall
V
4. Without using trigonometrical tables; prove that
() sin? 56°-cos? 34° = 0 (ii) sec? 10º – cot80° = 1
(ii) cos? 82° – sin8° = 0 (iv) sin(60° +6)= cos(30°-0)
5. Prove that cot(90° — O)sin(90°–0).
cos(90°-0)
cos? 20° + cos? 70°
6. Without using trigonometrical tables; evaluate
sin? 59° +sin? 31°
cot 40° 1 cos 35°
7. Without using trigonometrical tables; evaluate
tan 50° 2 sin 55°
8. If cose - sin 0 = 0 and 0 lies in the 1st quadrant, then find the value of e.
9. Without using trigonometrical tables; evaluate sin 44° cos 46° + cos 44°sin 46°
10. Without using trigonometrical tables; evaluate cosec²67º – tan? 23°
11. Without using trigonometrical tables; evaluate cose.sin(90°-0)+sin 0.cos(90°-).
12. Prove that cos(90°-O).coso
==1-cos²0
coto
13. Prove that sin(90°-O).cos(90°-0)- cot
1+cote
S​

Answer 1

Answer:

sin56-cos34

cos34=sin (90-34)=sin56

sin56-sin56=0

similarly with all