Question
If (sinx + siny) = a and (cosx + cosy) = b, then find the value of (sinx siny + cosx cosy). [A] (a²+b²-2)/ 2 [B] (a2-b2-2)/ 2 [C] (a²+b²-1)/ 2 [D](a²+b²+2)/2
More Trigonometry Questions
- If sin 2a = (3/4), then find the value of (sin a + cos a).
- What is the value of sin(B – C) cos(A – D) + sin(A – B) cos(C – D) + sin(C – A) cos(B – D)?
- What is the value of (4/3) cot2 (p/6) + 3 cos2 (150o) – 4 cosec2 45o + 8 sin (p/2)?
- If (3cos A - sin A) = 2 cos (90° - A), then find the value of cot A.
- if x sin 45 ˚ = y cosec 30 ˚ then find the value of
- If x = 4 cos A + 5 sin A snd y = 4 sin A – 5 cos A, then the value of x2+y2 is :
- If sin 2 A + sin 4 A = 1 and cos 2 A + cos 4 A = 1, then find the value of (sin 4 A - cos 4 A)
- A tree of height 'h' metres is broken by storm in such a way that its top touches the ground at a distance of 'x' metres from the root. Find the height at ...
- If A and B are complementary angles, then the value of- sin A cos B + cos A sin B – tan A tan B + sec2 A – cot2 B is–
- If 2cosec 2 A – cot 2 A = 5 and 0 o < A < 90 o , then find the value of ‘A’.
Relevant for Exams:
Hey! Ask a query
Please enter email id
The email must be a valid email address.
Please enter Mobile Number
Please enter valid Mobile Number
Please enter your Doubt
