Advertisements
Advertisements
प्रश्न
If sin θ = `4/5` then find cos θ.
बेरीज
उत्तर
sin2θ + cos2θ = 1
⇒ `(4/5)^2 + cos^2 θ = 1 ...( sin θ = 4/5)`
⇒ `16/25` + cos2θ = 1
⇒ cos2θ = `1 - 16/25`
⇒ cos2θ = `(25 - 16)/25`
⇒ cos2θ = `9/25`
⇒ cos θ = `sqrt (9/25)`
⇒ cos θ = `3/5`
Thus, the value of cos θ is `3/5`.
shaalaa.com
Trigonometric Ratios of 30° and 60° Angles
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Find the values of -
5 sin 30° + 3 tan 45°
Find the values of -
`4/5` tan2 60° + 3sin2 60°
Find the values of -
2 sin 30° + cos 0° + 3 sin 90°
Find the values of -
`[tan 60°]/[sin 60° + cos 60°]`
Find the values of -
cos2 45° + sin2 30°
Find the values of -
cos 60° × cos 30° + sin 60° × sin 30°
If cos θ = `15/17` then find sin θ.
Which of the following is the value of sin 90°?
2 tan 45° + cos 45° − sin 45° = ?
