Advertisements
Advertisements
प्रश्न
Evaluate the following: cos39° cos48° cos60° cosec42° cosec51°
Advertisements
उत्तर
cos39° cos48° cos60° cosec42° cosec51°
= `cos(90° - 51°) xx cos(90° - 42°) xx (1)/(2) xx (1)/(sin42°) xx (1)/(sin51°)`
= `sin51° xx sin42° xx (1)/(2) xx (1)/(sin42°) xx (1)/(sin51°)`
= `(1)/(2)`.
APPEARS IN
संबंधित प्रश्न
Solve the following equation for A, if tan 3 A = 1
Evaluate the following: `((1 - cosθ)(1 + cosθ))/((1 - sinθ)(1 + sinθ)` if θ = 30°
If A = B = 60°, verify that: sin(A - B) = sinA cosB - cosA sinB
If `sqrt(3)` sec 2θ = 2 and θ< 90°, find the value of
cos2 (30° + θ) + sin2 (45° - θ)
If ΔABC is a right triangle such that ∠C = 90°, ∠A = 45° and BC =7units, find ∠B, AB and AC.
Find the length of EC.
Find the value 'x', if:
Evaluate the following: sin31° - cos59°
Evaluate the following: tan(78° + θ) + cosec(42° + θ) - cot(12° - θ) - sec(48° - θ)
If A, B and C are interior angles of ΔABC, prove that sin`(("A" + "B")/2) = cos "C"/(2)`
