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The value of `cos(1/2cos^(-1)(1/8))`is(a)`3/4`(b) `-3/4`(c) `1/(16)`(d) `1/4` |
Answer» `cos(1/2cos^(-1)(1/8))` `cos(1/2theta)` `cos(theta/2)=3/4` `cos^(-1)(1/8)=theta` `costheta=1/8` `2cos^2(theta/2)-1=1/8` `2cos^2(theta/2)=1+1/8` `2cos^2(theta/2)=9/8` `cos(theta/2)=3/4`. |
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