Suggested: cos4a-sin4a - cos4a-sin4a=2cos2a-1 - cos4a-sin4a+1=2cos2a - cos4a+sin4a=1/4(3+cos4a) - cos4a-sin4a is equal to - 1/sin2a+cos4a/sin4a=cosa-cos4a - sin4a+cos4a=1-2 sin 2a cos 2a - cos4a-cos2a=sin4a-sin2a - (sin4a-cos4a+1)cosec2a=2 - 1-sin4a/cos4a=1+2tan2a - sin4a-cos4a=2sin2a-1 - cos4a sin4a Browse related:
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