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Maths / Introduction to Trigonometry / Trigonometric Identities
QUESTION
 

Given that  sinTheta =frac {a}{b},  then cosTheta  is equal to

OPTIONS
A. 

frac {b}{sqrt {b^2-a^2}}

B. 

frac {b}{a}

C. 

frac {sqrt {b^2-a^2}}{b}

D. 

frac {a}{sqrt {b^2-a^2}}

Right Option : C
EXPLANATION
Explain TypeExplanation Content
Text

cosTheta =sqrt {1-sin^2Theta }=sqrt {1-frac {a^2}{b^2}}=frac {sqrt {b^2-a^2}}{b}

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(Concept based Learning and Testing for [6th - 10th], NTSE, Bank & Govt. Exams)
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