Without using trigonometric tables, prove that:
(i) \( \cos 81^{\circ}-\sin 9^{\circ}=0 \)
(ii) ...
Without using trigonometric tables, prove that:
(i) \( \cos 81^{\circ}-\sin 9^{\circ}=0 \)
(ii) \( \tan 71^{\circ}-\cot 19^{\circ}=0 \)
(iii) \( \operatorname{cosec} 60^{\circ}-\sec 30^{\circ}=0 \)
(iv) \( \cot 34^{\circ}-\tan 56^{\circ}=0 \)
(v) \( \sin ^{2} 48^{\circ}+\sin ^{2} 42^{\circ}=1 \)
(vi) \( \cos ^{2} 72^{\circ}+\cos ^{2} 18^{\circ}=1 \)
ЁЯУ▓PW App Link - https://bit.ly/YTAI_PWAP
ЁЯМРPW Website - https://www.pw.live
Other Videos By PW Solutions
| 2023-02-16 | \[
\left(\frac{\cos 38^{\circ} \operatorname{cosec} 52^{\circ}}{\tan 18^{\circ} \tan 35^{\circ} ... |
| 2023-02-16 | \[
\left(\frac{2 \tan ^{2} 30^{\circ} \sec ^{2} 52^{\circ} \sin ^{2} 38^{\circ}}{\operatorname{c... |
| 2023-02-16 | рдШрд╛рд╕ рдХреЗ рдкрд╛рд░рд┐рд╕реНрдерд┐рддрд┐рдХ рддрдВрддреНрд░ рдореЗрдВ рд╕рдВрдЦреНрдпрд╛ рдХрд╛ рдкрд┐рд░рд╛рдорд┐рдб рд╣реЛрддрд╛ рд╣реИ
(A) рд╣рдореЗрд╢рд╛ рд╕реАрдзрд╛
(B) рдпрд╛ рддреЛ рд╕реАрдзрд╛ рдпрд╛ рдЙрд▓реНрдЯрд╛
(C... |
| 2023-02-16 | \[
\frac{\left(\sin ^{2} 23^{\circ}+\sin ^{2} 67^{\circ}\right)}{\left(\cos ^{2} 13^{\circ}+\cos... |
| 2023-02-16 | Without using trigonometric tables, prove that:
(i) \( \sin 32^{\circ} \cos 58^{\circ}+\cos 32^{... |
| 2023-02-16 | Without using trigonometric tables, find the value of each of the expressions
(v) given below:
\... |
| 2023-02-16 | In the given figure, \( \triangle O D C \sim \triangle O B A, \angle B O C=115^{\circ} \) and \(... |
| 2023-02-16 | Without using trigonometric tables, find the value of each of the expressions given below:
\[
2\... |
| 2023-02-16 | Without using trigonometric tables, prove that:
(W)
(i) \( \sin ^{2} 12^{\circ}+\sin ^{2} 78^{\c... |
| 2023-02-16 | Express each of the following in terms of trigonometric ratios of angles between \( 0^{\circ} \)... |
| 2023-02-16 | Without using trigonometric tables, prove that:
(i) \( \cos 81^{\circ}-\sin 9^{\circ}=0 \)
(ii) ... |
| 2023-02-16 | Without using trigonometric tables, find the value of each of the expressions given below:
\[
3 ... |
| 2023-02-16 | Without using trigonometric tables, evaluate:
(i) \( \frac{\sin 26^{\circ}}{\cos 64^{\circ}} \)
... |
| 2023-02-16 | рдкреНрд░рд╛рдХреГрддрд┐рдХ рд╕реНрдХреЗрд╡реЗрдиреНрдЬрд░ рдХреА рддрд░рд╣ рдХрд╛рд░реНрдп рдХрд░рддреЗ рд╣реИ (A) рдорд╛рдирд╡ (B) рдХреАрдЯ (C) рдЬрдиреНрддреБ (D) рд╕реВрдХреНрд╖реНрдордЬреАрд╡ |
| 2023-02-16 | For each of the following statements state whether true (T) or false (F):
(i) Two circles with d... |
| 2023-02-16 | Each question consists of two statements, namely, Assertion (A) and Reason (R). For selecting th... |
| 2023-02-16 | Each question consists of two statements, namely, Assertion (A) and Reason (R). For selecting th... |
| 2023-02-16 | In the given figure, \( O \) is the centre of the circle and \( T P \) is the tangent to the cir... |
| 2023-02-16 | рдЗрдХреЛрд╕рд┐рд╕реНрдЯрдо рдХреЛ рдирд┐рдореНрди рдкреНрд░рдХрд╛рд░ рдкрд░рд┐рднрд╛рд╖рд┐рдд рдХрд┐рдпрд╛ рдЬрд╛рддрд╛ рд╣реИ
(A) рдкреМрдзреЛрдВ рддрдерд╛ рдЬрдиреНрддрдУрдВ рдХреЗ рдордзреНрдп рд╕рдореНрдмрдиреНрдз
(B) рдЬреИрд╡рд┐рдХ рдд... |
| 2023-02-16 | In a right triangle \( A B C \), right-angled at \( B \), \( D \) is a point on hypotenuse such ... |
| 2023-02-16 | A vertical pole of length \( 7.5 \mathrm{~m} \) casts a shadow \( 5 \mathrm{~m} \) long on the g... |
0