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Given that sin(θ+30°)=cos2θ, find the value of cos(θ+40°).
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Jun 17, 2021
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Mathematics Form 2
by
anonymous
Given that sin(θ+30°)=cos2θ, find the value of cos(θ+40°).
trigonometry
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Jun 17, 2021
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anonymous
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Jan 30
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easyadmin
Best answer
sin(θ+30°)=cos2θ
θ+30+2θ=90
∴ cos 60=0.5
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