0

Guest

Courses New

Solve : sin x^1/2 + cos x ^1/2 > 1

Solve : sin x^1/2 + cos x ^1/2 > 1

Grade:11

1 Answers

Jitender Singh IIT Delhi
askIITians Faculty 158 Points
9 years ago
Ans: x > 0
Sol: sin x^1/2 + cos x^1/2 > 1
First we need to define the domain. Since x is in sqroot, so
x >= 0......(1)
sin (a + b) = sin a.cos b + cos a.sin b
Using this relation, we have
sin x^1/2 + cos x^1/2 = 2^1/2 sin (x + π/4)
2^1/2 sin (x + π/4) > 1
sin (x + π/4) > 1/(2^1/2)
Take \sin^{-1}on both sides
\sin^{-1}sin (x +π/4) >\sin^{-1}((1/(2^1/2))
\sin^{-1}((1/(2^1/2)) =π/4
x + π/4 >π/4
x > 0.....(2)
Intersection b/w (1) & (2) is x > 0
Thanks & Regards
Jitender Singh
IIT Delhi
askIITians Faculty

Think You Can Provide A Better Answer ?

Other Related Questions on Trigonometry

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More