Advertisements
Advertisements
प्रश्न
cos 45° = ?
विकल्प
sin 45°
sec 45°
cot 45°
tan 45°
Advertisements
उत्तर
sin 45°
Explanation:
`cos 45^circ = 1/sqrt2`, `sin 45^circ = 1/sqrt(2)`
∴ cos 45° = sin 45°
APPEARS IN
संबंधित प्रश्न
Prove the following trigonometric identities.
`(cosec A)/(cosec A - 1) + (cosec A)/(cosec A = 1) = 2 sec^2 A`
Prove the following identities:
`1/(1 + cosA) + 1/(1 - cosA) = 2cosec^2A`
Prove the following identities:
`sqrt((1 - cosA)/(1 + cosA)) = cosec A - cot A`
Prove the following identities:
`1 - cos^2A/(1 + sinA) = sinA`
Prove the following identities:
`cosA/(1 + sinA) + tanA = secA`
Prove the following identities:
sec4 A (1 – sin4 A) – 2 tan2 A = 1
If x = a cos θ and y = b cot θ, show that:
`a^2/x^2 - b^2/y^2 = 1`
`sin^6 theta + cos^6 theta =1 -3 sin^2 theta cos^2 theta`
Write the value of sin A cos (90° − A) + cos A sin (90° − A).
What is the value of (1 + tan2 θ) (1 − sin θ) (1 + sin θ)?
Prove the following identities:
`(tan"A"+tan"B")/(cot"A"+cot"B")=tan"A"tan"B"`
Prove the following identity :
`(cotA + cosecA - 1)/(cotA - cosecA + 1) = (cosA + 1)/sinA`
If sec θ = x + `1/(4"x"), x ≠ 0,` find (sec θ + tan θ)
Prove that: 2(sin6 θ + cos6 θ) – 3 (sin4 θ + cos4 θ) + 1 = 0.
Prove that `(cot "A" + "cosec A" - 1)/(cot "A" - "cosec A" + 1) = (1 + cos "A")/sin "A"`
Prove that cos θ sin (90° - θ) + sin θ cos (90° - θ) = 1.
Prove that sec2θ − cos2θ = tan2θ + sin2θ
If 5 sec θ – 12 cosec θ = 0, then find values of sin θ, sec θ
If 2sin2θ – cos2θ = 2, then find the value of θ.
