Sin थीटा +cos थीटा का मान सदैव 1 से बड़ा होता है ?
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Let θ be an arbitrary acute angle. Prove that sin(θ)+cos(θ)≥1sin(θ)+cos(θ)≥1.
(sin(θ)+cos(θ))2=1+2sin(θ)cos(θ)≥0
(sin(θ)+cos(θ))2=1+2sin(θ)cos(θ)≥0
so,
(sin(θ))+cos(θ))2(sin(θ)+cos(θ))2>1≥
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