prove that sin teta. cos(90-teta)+cos. sin(90-teta)=1
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sin theta into cos 90 minus theta + cos theta into sin 90 minus theta is equal to 1
sin theta into sin theta + cos theta into cos theta is equal to 1
sin square theta + cos square theta is equal to 1
why the identities sin square theta + cos square theta is equal to 1 therefore lhs is equal to RHS
is equal to 1 is equal to 1
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