if+sina+sin2a=1 find the value of cos8a+cos6a+cos4a+cos2a+cosa
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sina+sin^2a=1
=>sina=1-sin^2a
=>sina=cos^2a
=>sin^2a=cos^4a
=>1-cos^2a=cos^4a
=>cos^2a+cos^4a=1
plz mark as the brainliest
=>sina=1-sin^2a
=>sina=cos^2a
=>sin^2a=cos^4a
=>1-cos^2a=cos^4a
=>cos^2a+cos^4a=1
plz mark as the brainliest
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