Chapter 8 – Introduction to Trigonometry
If tan A = cot B, prove that A + B = 90°
05
Oct
If tan A = cot B, prove that A + B = 90° If tan A = cot B prove that A + B = 90° October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A.
05
Oct
If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A. find the value of A. If tan 2A = cot (A – 18°) where 2A is an acute angle October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Show that : (ii) cos 38° cos 52° – sin 38° sin 52° = 0
05
Oct
Show that : (ii) cos 38° cos 52° – sin 38° sin 52° = 0 Show that : (ii) cos 38° cos 52° – sin 38° sin 52° = 0 October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Show that : (i) tan 48° tan 23° tan 42° tan 67° = 1
05
Oct
Show that : (i) tan 48° tan 23° tan 42° tan 67° = 1 Show that : (i) tan 48° tan 23° tan 42° tan 67° = 1 October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Evaluate : (iv) cosec 31° – sec 59°
05
Oct
Evaluate : (iv) cosec 31° – sec 59° Evaluate : (iv) cosec 31° – sec 59° October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Evaluate : (iii) cos 48° – sin 42°
05
Oct
Evaluate : (iii) cos 48° – sin 42° Evaluate : (iii) cos 48° – sin 42° October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Evaluate : (ii) tan 26°/cot 64°
05
Oct
Evaluate : (ii) tan 26°/cot 64° Evaluate : (ii) tan 26°/cot 64° October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Evaluate : (i) sin 18°/cos 72°
05
Oct
Evaluate : (i) sin 18°/cos 72° Evaluate : (i) sin 18°/cos 72° October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
State whether the following are true or false. Justify your answer. .(i) sin (A + B) = sin A + sin B. (ii) The value of sin θ increases as θ increases. (iii) The value of cos θ increases as θ increases. (iv) sin θ = cos θ for all values of θ. (v) cot A is not defined for A = 0°
05
Oct
State whether the following are true or false. Justify your answer. .(i) sin (A + B) = sin A + sin B. (ii) The value of sin θ increases as θ increases. (iii) The value of cos θ increases as θ increases. (iv) sin θ = cos θ for all values of θ. (v) cot [...]
If tan (A + B) = √3 and tan (A – B) = 1/√3 ; 0° B, find A and B.
05
Oct
If tan (A + B) = √3 and tan (A – B) = 1/√3 ; 0° B, find A and B. find a and b . If tan (A + B) = √3 and tan (A – B) = 1/√3 ; 0° <A> B October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , [...]